Apply to products is a panel on an artwork’s own page. Reach it from the
button of that name on the artwork list, or by opening
an artwork and scrolling to it.
This applies one design. For several designs or logos on the same blank, the
panel links you to the
decoration tool instead. Choosing products
Two tabs:
Switching tabs clears whatever you had selected.
Select the products you want, then set a placement for each. Selecting one shows
its placement options and previews the result, flat and on model.
Import collection pulls in a whole collection of blanks instead of picking
them one by one. It appears only once you have a collection, and a collection’s
placements cannot be edited here.
On the Decorated products tab, a placement that already holds a different artwork
is marked. Applying replaces the artwork already at that placement, and the
screen names what it will overwrite.
Colors
Product colors controls which colors get decorated. It is on the Blanks
tab only, because that tab copies the blank and this narrows what the copy
carries. A decorated product keeps every color it already has.
The link beside it reads Disable all while every color is on and Enable
all once any is off. Disable all leaves one color on rather than none.
A blank carrying none of the enabled colors is skipped entirely.
Where it lands
Destination store puts the resulting products straight into a store, or leave
it on None. It sits on the Blanks tab only.
Decoration method defaults to Use each product’s default, so you only
change it when this artwork is applied differently from the product’s usual
method. It has no effect on Fulfill Engine products, which carry their own.
The button at the bottom reads Apply to 4 products, counting what it will
affect, and creates them. 
