I been using this software for years. I am thinking of moving my comics from my place to a storage. Would a new Collection work because this collection I will not always have access to verify anything except my memory and this application?
You could indeed move them to a new sub-collection in the app, which would then show as a tab on your main screen. This is probably the nicest solution if I understand your situation correctly.
Alternatively you could use the location field. You can tap and hold a comic, then tap more, then tap Action > Edit and modify only the location field and set it to “Storage”.
You can use the folders top left to group by Location (or create multi-level folder setup with Location, then Series).
Try it with a couple of comics, see if you like the result, then decide!