Thanks in advance for any guidance.

I'm struggling to get a good workable solution to being able to "link" a product to the stock control of another, to be able to sell it in different ways. (Link is how Cornerstone described it, which is where I have come from, so I'll stick with that term for the moment).

The problem I'm trying to solve is selling a product in different presentations which still allows for accurate stock control AND is easy & obvious on the invoices / estimates.

e.g. Apoquel 16mg tablets are sold individually, or in combination with 5.4mg tablets. So there's a 16mg product, and a 5.5mg product. And then the only way to create the combination I have found is to create a template containing the 16mg and the 5.5mg and another product for the dispensing fee.

This is functionally kind of adequate, though not adaptable or even close to optimal. It can be made to look ok on the client invoice. But working with it on the invoice will show 3 lines - 5.5mg, 16mg, & dispensing fee. Which is totally different to how every other product is presented, and on a lengthy invoice is making it difficult to check for missed or incorrect charges (e.g. billing 1 tablet instead of 30 or 60 is an expensive mistake that is easy to do. 

In the same way that we can link to a product pricing template for price info, can it be made possible to link to an existing product for stock control? And still allow all the normal product set up information. It would allow cheaper pricing for whole packets for chronic meds vs split doses for urgent care (smaller volume) e.g. per ml or per bottle. (Selecting a drop-down list fixed price leads to challenges for the staff member - they have to think about something that should be really, really easy).

And while I'm in the suggesting mood, Cornerstone asked for confirmation each time a prescription label was a single unit - "The quantity entered is one. Is this quantity correct?" It sounds like a pita, but it stops a lot of missed charges, especially during a busy consult session.