Help combining multiple SKUs into one capped product quantity

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Hello to all, hopefully one of you could help me figure this out.

Im trying to set up a pop up shop that uses the following process, however I can’t seem to combine multiple SKUs under one product capped quantity:

I have a limited amount of tickets for sale (quantity - 300), the tricky part is they can combine to that 300 cap by being sold in either of three different types of packages (platinum, gold and silver) all depending on price. It doesn’t matter if they are all sold as the platinum package etc.. but the combined amount must not exceed 300. So the overall quantity must track the different numbers of sales up to the 300 mark. Is there any way I can set my shopify site up to do this? 

I really appreciate your help in advance.