If Statement help - If one item is X and another is not Y then exit sub?

[Battletoads]

I have a userform that allows users to choose their name (cboName) and an item (cboItem) from comboboxes.

Now, 2 specific items can only be selected from certain people

Lets say there's ItemA, ItemB and ItemC, and the people are named Joe, Bob and John

Now, only Bob and Joe can select ItemA or ItemC. How do I formulate If statements that prevent John from selecting ItemA or ItemC?

Something like:

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Thanks for the help

[stnkynts]

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