You should be able to by logging onto steam through your browser and going to the Collection's page. There is a button on the right to create a collection.
thanks a lot for the answer even though that raised one more question ... your second answer made me think that mean that I can upload two models right ? one which will be LoD1 and one which will be LoD0, but I hope that it is allowed to upload only one model since my model is actually only around 330 triangles (LoD1 limit…
exactly my thoughts... i think the way this stuff is handled right now is very far from fair. i feel like i am throwing shit at the wall and hope something sticks, while those tournament guys just go through the back entry. on the baba yaga courier, i´d definetly go with the least colorfull top right one.