The only way to selectively edit an image in Lightroom is with the local adjustment tools, adjustment brush, gradient filter or radial filter. They are pretty good, but not nearly as good as using Photoshop. If this was my project I would use Photoshop to mask an edited version of the top part of the image, into a non edited version of the bottom portion.
I don't think the adjustment brush will help me, because I want a full range of editing capabilities for the main image, and I just want to mask off the entire bottom so it's not affected at all. Is there a way I can edit ONLY the top portion of the image, with full range of editing?
Probably a dozen ways to do this, but here's two using only the panorama output file with logo:
1) Not sure what you mean by "full range." What's missing in the Adjustment bush. You can paint in the upper image using Auto Mask and then go back over the area with Auto Mask turned off to fill in skipped areas.
2) You could also create a LR virtual copy and adjust the whole image, Edit in PS 'Open as Layers' both the original unedited and virtual copy with edits and then use PS's selection tools to select the logo, invert selection, and delete the upper image area.
Yeah I'm thinking I might just have to edit in photoshop - I use lightroom for practically everything, and it's so convenient so I was hoping there was a way to make it work! Thank you for your suggestion!