How do I add decal and sticker items to my inventory?
If you know the part number for the stickered piece, great! Add it like a normal
part.
If you don't know the part number, do as follows:
1) Brickognize is your friend, snap a pic, it will find the part for you(99%
of the time)
2) You can search by putting the base part number with pb* after. For example:
Tile 2 x 4(87079) would search as 87079pb* and you will see the endless list
of stickered pieces here: https://www.bricklink.com/v2/search.page?q=87079pb*&tab=A#T=A