The only options I know of for transparency is under material edit. Just right-click on an existing color close to what you are looking for (in the materials bar lower left corner ) and select Append new material. This will add the material to the right end of the material bar. Assign the new material to your surface(s). Go to the new material and right-click again and select "Edit Material and all the options are there (including transparency). I am not sure how a transparent texture will work, if I use a texture with a transparent "Alpha" channel, it makes that part of the surface transparent.
Art
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