Filter based macros to be further filtered by drop down selection?

I have some macro buttons which filter data on time frames... They are housed in Sheet1 and they filter Sheet2.
An example of one is:

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I'd like a combo box in Sheet 1, which contains a drop down list of supplier names. Supplier names are housed as a list in Sheet6 and are selected in Column D of Sheet2.
Is it possible that a supplier can be selected from the combo box, and then one of the time frame buttons is clicked, which applies the time filter but now also filters column D of Sheet2 to the specific supplier?

For this example lets say the supplier list will be:
All
Supplier 1
Supplier 2
Supplier 3
Supplier 4

I may have made this way more complex than I need to, but I'm not sure how to adapt the above code to cater for this additional filter.

Thanks in advance.



also posted here

Anyone able to advise on this? thanks