Microvellum Community

Vector Location Formula Adjustability

Hello,

I'm trying to make a custom draw box and want to add a rebate that can adjust to the length of the draw side.

I'm using a PLINES5 token with the vector location 540;18;4.2|0;18;4.2 
I want to have the 540 location adjustable to any length the part is so would have thought something like (Panel_Length);18;4.2|0;18;4.2 would have worked.

Can anyone tell me what I'm doing wrong?