viewport picking - unintended, how to avoid?

[Brooke]

I'm very much not up to speed on the use and operation of viewports, but trying. I have a survey drawing at a different rotation than orthogonal which I want to align and import much of into my arch dwgs. I created a rotated viewport to align it and after working ignorantly throught the scale probs got things looking OK, but when I try to crop some uneeded stuff out prior to import I keep selecting the viewport. Perhaps this just is not an appropriate way to go but up to now I have not had the problem of VP picking being problematic.