You're forgetting the grouping tool in Poser (the little dot-in-a-square symbol. But you could have a problem with seeing the individual parts, one inside the other. [Thinks] You have a short cylinder for the top and bottom, and another to make that apparent joint. With two more between to make the concentric tubes. There are several useful things the grouping tool can do. First, you can make a copy of only the selected parts of a prop. So you can remove the ends of those concentric cylinders to make tubes. Trivial, maybe, but why leave polygons in the model which will never show. Second, you can Reverse Normals. Which means that you could select the polygons of the transparent cylinder, reverse the normals, and you could see the inner cylinder to work on, and then switch it back. Third, if you set up the Groups right as you work through the object, you could use Add All and Remove Group. As long as you have Material Groups set, you don't need to keep these Groups in the final version. I think I can see how I could get Material Groups for this. Some of it could be a bit of a fiddle. It can be one single Prop.