How do you add a "decal" to a model?+How do you make a transparent texture?

[TB2]

Below are 2 questions needed for my ambulance I am creating.

Several questions needed from everyone:
-How do you make a texture transparent to show on the model in Milkshape?
-How do you apply a decal (The BLPD decal on the Fordor Sedan as an example.) on a model?

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[Darksaber2213]

Regroup the side to its own group
Make the decal a material and apply it to the side

For a transparent, create a transparent texture, apply it to the transparent areas you want
When exporting, select the transparent material and click on edit. Then select "transparent' and "additive"

This is assuming that you use milkshape to model.

[TB2]

Sorry for the bump, but when selecting the material, it chooses another material other than the one I selected.

[TB2]

Also, the decal shows up black in milkshape.

[TB2]

The decal doesn't show up in-game.

[TB2]

In-game, the decal has a white overlay to it.