How to make a "invisible" model with a collision box?

[MasterWarlord]

I made a blank model with a collision box, but it is unselectable in-game.

https://imgur.com/AFSKKTr

I want a model that has no graphics visible, but can be selected by players. How do I do that?

 

[tillinghast]

you need to set the extents in sequence manager

you can test them out in sanity tester