But using the Excel component doesn't export the data to a file.
You could use the output of the component just to strip the units and then write the unitless data via WRITEEXCEl or WRITECSV, but that would be like taking a sledgehammer to crack a nut compared to simply dividing by the unit.
Of course you could double cick the component and manually chose "save file" from within Excel, but that wouldn't be automatic and a bit awkward, too.
So I guess dividing the matrix which should be written to a file by the desired unit will be the best approach.
If you use a matrix with elements of different dimensions in Prime, you will have to vectorize the division.