Converting a line to shape

Everywhere says Edit > Objects > Convert… But I don’t have Objects in my menus. I use omnigraffle 6.6.2. Since there is no user friendly or searchable help/manual to find a basic functionality, can anyone help please?

So… 6.6.2 is really old. Current version is 7.11.5 (Mac) but I find 7.10.2 is much more stable, even with its problems.

What are you trying to do? Convert a line to a shape? FWIW, I found that process to not be worthwhile. If you are trying to create a closed path, that will not do it (like it would in Corel Draw or other vector drawing programs). What it will do is create two paths: one on each side of the line.