WHY CAN'T I USEFULLY COPY & PASTE INTO THE SAME MEASURE? i.e., score 1: measure 1 voice 1 copy, score 2 paste measure 1 voice 2

This seems like an obvious feature to include. And the only reason I can fathom developers disallowing this easily included functionality would be one of ideological disagreement, as if copy-pasting a voice from one score into the next is somehow 'wrong'.

Can someone please tell me how I can combine voices into a single measure? i.e., when transcribing SATBP to GUITAR?

For example, I have a Bach piece with 10 voices, and each voice has 2-3 notes in the same measure. If I copy voice 1 and paste it into guitar measure 1 - great. Voice 1 is there. But if I copy voice 2 on the Bach piece and paste it into measure 1 on the guitar, it ERASES the first voice. If I exchange voices 1-2, and try to paste it as voice 1 - IT DOESN'T LET ME PASTE.

IF I "combine measures" it literally just makes the measure long, extending off the printable page, and retains the same number of voices, effectively not combining anything.

Or maybe a better way to put it is: how can I COPY MULTIPLE VOICES in the SAME MEASURE from Score #1 and PASTE these MULTIPLE VOICES as a SINGLE VOICE in the SAME MEASURE in Score #2?

OR do you really actually have to, one by one, enter the notes. Click Voice 2 enter notes, one by one. Side by side have the scores up. click voice 3 enter the notes, one by one. Etc?

I can't think of a more obviously useful function that could be OPTIONAL and defined by the user even. So can someone tell me what I'm missing? What is the rationale behind disallowing this feature?