Quote -  Depending on how you plan to use it, in some cases you can simply hide all the parts except the arms. I've attached an example. I shrank the duplicate 5% as well for a better over/under shoulder fit.

well, that works a bit, but I decided to try some other ways. Your way works for a one behind the other arangement, but not so much for above and below types. I tried the above and below type, found that increasing the breast size of the female a tad bit worked.

Also, trying to do that anyway for V3- and Aiko3 dosnt work so well, so if you are trying to add arms, best to stick with P4 or V4/A4