DT in object mode
One or multiple Trim Decals
ALT: Keep Trim Decal object and hide, instead of deleting it
Using Trim Cut
Align Decal to Edge
DT in edit mode
Align to Edge is a tool created to be used in conjunction with Trim Cut.
It is used to align a Decal object exactly with the edge of a mesh object.
The Decal and the target mesh object first selected in object mode, then a Decal edge and a target mesh edge selected in edit mode, in that order.
Align to Edge will exit edit mode setup the conditions to run Trim Cut right after.
And so you can run both tools in sequence by pressing
My free MACHIN3tools addon has a similar, but more advanced variation of this tool in its Align Pie Menu