Hi Grover,

When you need to have lengths in the cutting lists make a bar material and apply a structure to the panel.

In your case, first go to Libraries>Bar materials and create a plinth “bar” material that has the same section as you pvc.

Then apply  an Assembled structure to the plinth. Edit the structure so that there is only 1 cross bar in the plinth bar material and all the parts are nil.

The cutting lists will now have the plinths as lengths of bar material.

Hope this is helpful.

Best regards,

Ness