The problem is that I can’t find a script call function (which would be similar enough to just replace strings), nor would I know where to put it (not a strong programmer). I figure “If I can find a similar script call function from another YEA Script, I can just copy the format and replace the variables and strings with those linked to the SPLIT_EXP variable in the Party Engine.” I managed the easy part of linking the menu option to the switch (4999 in this case), and I made a parallel process common event to activate when the 4999 script is on.

I used one of the custom switches (the first one) to turn shared experience (with non-battling party members) on.