One way would be to use Stored Queries.
But I would probably just make a menu or toolbar buttons which run the Find command for each thing you want to search for:
Find g12345_* IN "D:\Clients"
Or similar. You can then give the button a label with the client's name, and click it to run the search whenever you need to.
You can use the Find command arguments to change what it does, e.g. if you want to output the results to a separate collection for each client.