This conversation has been merged. Please reference the main conversation: Lightroom: Catalogs within Catalogs (or Master Catalogs)
1. Keeping all images in one catalog, over time will slow it down, clutter it.
So, from time to time I export them into archive catalogs on external drives.
These drives can be plugged into the computer, mapped to one drive letter (A:).
I loose track of all the images because they are not in one central place.
Finding the exported disk / catalog is the issue.
3. I suggest that for the exported catalog a mount point is created in the main catalog.
That way exported images can stay in the original catalog with
a preview proxy and
a reference to the catalog/disk that they were exported to.
The archive disks should be named uniquely, the archive catalogs, too.
This way you can easily find images, plug in the referenced disk
and access the images.