Hi Thusitha,

There are 2 methods to set the back at 3/4″ from the back of the cabinet, either panel by panel or using a sub-method.

To do this for just this cabinet, select the top and in the “links” section open “back”, set the Overlap parameter to 3/4 :

Repeat this for the sides and bottom.

You can also do this using the sub-method “boxfull”.

All the best,

Ness

PS: To gain time learning how to use Polyboard,  you might consider buying a training package. Like this we can look how to set up your Manufacturing Methods for general cabinets and framed cabinets. You’ll find that 1 hour of training can save you days of trail and error and asking questions on the forum.

I would suggest that you start with a 4 hour pack that you can buy from this page :

https://wooddesigner.org/train…..g-service/