Unfortunately, the suggested "left-click and drag" keeps returning an error: "You cannot change, move a part of, or insert cells in a pivot table report. If you want to insert cells on the worksheet, drage the entire report out of the way..."
Here is the example I was referring to.
<TABLE style="WIDTH: 227pt; BORDER-COLLAPSE: collapse" border=0 cellSpacing=0 cellPadding=0 width=303 x:str><COLGROUP><COL style="WIDTH: 48pt" width=64><COL style="WIDTH: 137pt; mso-width-source: userset; mso-width-alt: 6692" width=183><COL style="WIDTH: 42pt; mso-width-source: userset; mso-width-alt: 2048" width=56><TBODY><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: #e0dfe3; BORDER-LEFT: black 0.5pt solid; BACKGROUND-COLOR: transparent; WIDTH: 48pt; HEIGHT: 15pt; BORDER-TOP: black 0.5pt solid; BORDER-RIGHT: #e0dfe3" class=xl22 height=20 width=64>Property ID</TD><TD style="BORDER-BOTTOM: #e0dfe3; BORDER-LEFT: black 0.5pt solid; BACKGROUND-COLOR: transparent; WIDTH: 137pt; BORDER-TOP: black 0.5pt solid; BORDER-RIGHT: #e0dfe3" class=xl22 width=183>y</TD><TD style="BORDER-BOTTOM: #e0dfe3; BORDER-LEFT: black 0.5pt solid; BACKGROUND-COLOR: transparent; WIDTH: 42pt; BORDER-TOP: black 0.5pt solid; BORDER-RIGHT: black 0.5pt solid" class=xl23 width=56>Total</TD></TR><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: #e0dfe3; BORDER-LEFT: black 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 15pt; BORDER-TOP: black 0.5pt solid; BORDER-RIGHT: #e0dfe3" class=xl22 height=20>TDC0001</TD><TD style="BORDER-BOTTOM: #e0dfe3; BORDER-LEFT: black 0.5pt solid; BACKGROUND-COLOR: transparent; BORDER-TOP: black 0.5pt solid; BORDER-RIGHT: #e0dfe3" class=xl22>Sum of Rentable Area</TD><TD style="BORDER-BOTTOM: #e0dfe3; BORDER-LEFT: black 0.5pt solid; BACKGROUND-COLOR: transparent; BORDER-TOP: black 0.5pt solid; BORDER-RIGHT: black 0.5pt solid" class=xl26 x:num>0</TD></TR><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: #e0dfe3; BORDER-LEFT: black 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 15pt; BORDER-TOP: #e0dfe3; BORDER-RIGHT: #e0dfe3" class=xl24 height=20> </TD><TD style="BORDER-BOTTOM: #e0dfe3; BORDER-LEFT: black 0.5pt solid; BACKGROUND-COLOR: transparent; BORDER-TOP: #e0dfe3; BORDER-RIGHT: #e0dfe3" class=xl25>Sum of Usable Area</TD><TD style="BORDER-BOTTOM: #e0dfe3; BORDER-LEFT: black 0.5pt solid; BACKGROUND-COLOR: transparent; BORDER-TOP: #e0dfe3; BORDER-RIGHT: black 0.5pt solid" class=xl27 x:num>0</TD></TR><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: #e0dfe3; BORDER-LEFT: black 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 15pt; BORDER-TOP: #e0dfe3; BORDER-RIGHT: #e0dfe3" class=xl24 height=20> </TD><TD style="BORDER-BOTTOM: #e0dfe3; BORDER-LEFT: black 0.5pt solid; BACKGROUND-COLOR: transparent; BORDER-TOP: #e0dfe3; BORDER-RIGHT: #e0dfe3" class=xl25>Sum of Gross Area</TD><TD style="BORDER-BOTTOM: #e0dfe3; BORDER-LEFT: black 0.5pt solid; BACKGROUND-COLOR: transparent; BORDER-TOP: #e0dfe3; BORDER-RIGHT: black 0.5pt solid" class=xl27 x:num>0</TD></TR><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: #e0dfe3; BORDER-LEFT: black 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 15pt; BORDER-TOP: #e0dfe3; BORDER-RIGHT: #e0dfe3" class=xl24 height=20> </TD><TD style="BORDER-BOTTOM: #e0dfe3; BORDER-LEFT: black 0.5pt solid; BACKGROUND-COLOR: transparent; BORDER-TOP: #e0dfe3; BORDER-RIGHT: #e0dfe3" class=xl25>Sum of Gross Measured Area</TD><TD style="BORDER-BOTTOM: #e0dfe3; BORDER-LEFT: black 0.5pt solid; BACKGROUND-COLOR: transparent; BORDER-TOP: #e0dfe3; BORDER-RIGHT: black 0.5pt solid" class=xl27 x:num>0</TD></TR></TBODY></TABLE>