Do I have to authenticate when calling a restlet from a suitelet?

use the internal url of the restlet

Thanks.

dont know what you are trying to ask, but I would guess no

A button that looks like pic related that I can set inventory detail.

im not sure where all your pixels went

When do an adjustment for example I enter the quantity, then click a button where I set the detail. If I'm not mistaken this creates an inventory detail subrecord which gets attached to that transaction line. I want to emulate this behavior on a custom record. User sets the quantity them adjusts the detail.

but you cant add a custom subrecord to a record

I see. I thought it would be possible to use the native inventory detail subrecord.

im not sure what you would have wanted to do with it on a custom record

Ok here goes. I want to create a Pallet License Plate system. Users can move pallets, place pallets on hold etc. Each pallet record has inventory attached to it. sometimes there are multiple lots on a pallet. The first method that I thought would be to have a separate "Pallet Inventory Line" record that would be attached to the parent record and displayed in a subtab. However if I can set the inventory detail in the parent record itself, that would be preferable.

as in an inventory detail has an effect on inventory numbers