Is it possible to format rpt.index so that the sl no apears line i,ii,iii,iv etc.

You can write table relations for a column to replace a repeat index to whatever you want it to.

For instance, when doing work a customer once, all index numbers needed to start at 500. We would write a relation to skip the first 499 numbers and sort on the new column.

The problem with roman numerals is that they don't follow numerical or alphabetical sequence. So while you could write a relation to get you the roman numerals you want with a giant if/elseif list, you couldn't sort on the column with roman numerals. You most likely will end up having to fix the repeat region and sort it manually.