Thanks, I'll be awaiting your further reply. But, do note, the solution does not require any detailed understanding of this Manitoba credit. It very simply requires a multi-line area in which to enter the (several) primary residences occupied during the tax year, with number of months and rent paid on each line.
UFile has very many other places where we can click to "add one more item/line" of the same kind as we are working on, so UFile could easily do the same in this case.