The easiest suggestion is to sort the Regions descending order, show the top 5, and group the rest of the regions. Note, the example here shows series of steps I took and I used slightly different techniques to generate each step. In your case, you would only do this to a single PivotTable.
In my sample data set, I have two columns: Region and Amount.
First, I created a PivotTable, putting Region in rows and Amount in Values. I sort them in descending order by amount. (Columns A:B)
Next, I grouped all but the first five items. This created a Group1 (Columns D:E)
Next, I collapsed all the grouped items (right click -> Expand/Collapse/Collapse Entire Field). (Columns G:H)
Finally, I used the move command to move the Group1 all the way to the bottom (right click -> Move/Move Group1 to End). (Columns J:K)
| A | B | C | D | E | F | G | H | I | J | K |
Region | Sum of Amount | Region | Sum of Amount | Region | Sum of Amount | Region | Sum of Amount | | | | |
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<tbody>
[TD="bgcolor: #cacaca, align: center"]3[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="bgcolor: #000000"][/TD]
[TD="bgcolor: #000000"][/TD]
[TD="bgcolor: #cacaca, align: center"]4[/TD]
[TD="align: left"]Region G[/TD]
[TD="align: right"]538,595[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Group1[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Group1[/TD]
[TD="align: right"]2,319,183[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region A[/TD]
[TD="align: right"]459,319[/TD]
[TD="bgcolor: #cacaca, align: center"]5[/TD]
[TD="align: left"]Region A[/TD]
[TD="align: right"]459,319[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region B[/TD]
[TD="align: right"]418,785[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region G[/TD]
[TD="align: right"]538,595[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region C[/TD]
[TD="align: right"]450,221[/TD]
[TD="bgcolor: #cacaca, align: center"]6[/TD]
[TD="align: left"]Region E[/TD]
[TD="align: right"]450,618[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region K[/TD]
[TD="align: right"]415,544[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region A[/TD]
[TD="align: right"]459,319[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region E[/TD]
[TD="align: right"]450,618[/TD]
[TD="bgcolor: #cacaca, align: center"]7[/TD]
[TD="align: left"]Region C[/TD]
[TD="align: right"]450,221[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region I[/TD]
[TD="align: right"]405,332[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region E[/TD]
[TD="align: right"]450,618[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region G[/TD]
[TD="align: right"]538,595[/TD]
[TD="bgcolor: #cacaca, align: center"]8[/TD]
[TD="align: left"]Region J[/TD]
[TD="align: right"]435,275[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region F[/TD]
[TD="align: right"]402,107[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region C[/TD]
[TD="align: right"]450,221[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region J[/TD]
[TD="align: right"]435,275[/TD]
[TD="bgcolor: #cacaca, align: center"]9[/TD]
[TD="align: left"]Region B[/TD]
[TD="align: right"]418,785[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region D[/TD]
[TD="align: right"]400,573[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region J[/TD]
[TD="align: right"]435,275[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Others[/TD]
[TD="align: right"]2,319,183[/TD]
[TD="bgcolor: #cacaca, align: center"]10[/TD]
[TD="align: left"]Region K[/TD]
[TD="align: right"]415,544[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region H[/TD]
[TD="align: right"]276,842[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Grand Total[/TD]
[TD="align: right"]4,653,211[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Grand Total[/TD]
[TD="align: right"]4,653,211[/TD]
[TD="bgcolor: #cacaca, align: center"]11[/TD]
[TD="align: left"]Region I[/TD]
[TD="align: right"]405,332[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region G[/TD]
[TD="bgcolor: #cacaca, align: center"]12[/TD]
[TD="align: left"]Region F[/TD]
[TD="align: right"]402,107[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region G[/TD]
[TD="align: right"]538,595[/TD]
[TD="bgcolor: #cacaca, align: center"]13[/TD]
[TD="align: left"]Region D[/TD]
[TD="align: right"]400,573[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region A[/TD]
[TD="bgcolor: #cacaca, align: center"]14[/TD]
[TD="align: left"]Region H[/TD]
[TD="align: right"]276,842[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region A[/TD]
[TD="align: right"]459,319[/TD]
[TD="bgcolor: #cacaca, align: center"]15[/TD]
[TD="align: left"]Grand Total[/TD]
[TD="align: right"]4,653,211[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region E[/TD]
[TD="bgcolor: #cacaca, align: center"]16[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region E[/TD]
[TD="align: right"]450,618[/TD]
[TD="bgcolor: #cacaca, align: center"]17[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region C[/TD]
[TD="bgcolor: #cacaca, align: center"]18[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region C[/TD]
[TD="align: right"]450,221[/TD]
[TD="bgcolor: #cacaca, align: center"]19[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region J[/TD]
[TD="bgcolor: #cacaca, align: center"]20[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Region J[/TD]
[TD="align: right"]435,275[/TD]
[TD="bgcolor: #cacaca, align: center"]21[/TD]
[TD="bgcolor: #000000"][/TD]
[TD="align: left"]Grand Total[/TD]
[TD="align: right"]4,653,211[/TD]
</tbody>
Hope this helps. It's not difficult to do programmatically using VBA, if you want to fully automate this process.