Albums from multiple Lightroom Databases in 1 albumset

Can I combine albums from multiple Lightroom Databases in 1 albumset in backlight.
I want to combine albums from 3 lightroomdatabases in one client response album set. Is this possible?

I think that would be problematic, if not impossible. Have you considered using Backlight’s publisher instead? In which case, you’re just uploading JPEGs to Backlight, and we don’t care about your Lightroom catalogs.