random numbers from 4 different sequences into one

[lgd53]

I have 4 different check # sequences.
I do a % of the total number of Checks based on the total.
I then used the # of items to select, of each of the sequences to = my total sample size of 25.

My question is, how can I get the random # to select and then put them all together to give me my 25 total sample.

Thanks
Larry