On occasion while using Revit I need to define a level to attach to but don't really want to see these 'attachment' levels in every elevation view that might hit it. Of course with Revit, there are a few workarounds for having access to these levels but not having to actually see them.
1. Turn them off. Yep, it is a pain but you can select and turn them off in your views. You could also put them into a filter and turn them off by applying the filter to each view. The con here is having to do the work, and repeat it for each new view. Also a con is you can't actually pick the level in your elevations - since they are off. Lots of on/off happening in this method.
2. Make them small (and put them in the corner. Sure, make them postage stamp size by using X-X and Y-Y elevations to shrink them down such that normal views don't interface with them. Again, not the best method since again you can't pick them in order to be used. If you use of these levels is strickly via property changes then this may be a good option.
3. Make them white! Yep, sounds odd but try it before judging. Create a level line style that has the level head turned off and make the color of linetype white. When printed you won't see anything. And the best part these little 'white' lines don't show in your views but you can highlight/pick or otherwise use them - since you can actually select them. A con with this method is they will of course export to DWG, so if you plan is to provide 100% complete drawings this might not be the best option.
Have another level line technique, email me. I need blog material. ;)