Userform Combobox to populate based on selection in another combobox

Good day,
I am looking for some combobox code. I need to use a combobox and on selection I need to change the entry in another combobox in the same userform.

Userform = frmdata

Combobox4 =

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I need that if Combobox4 = Group 1 then Combobox5 will = to "A, B, C, D"
if Combobox4 = Group 3 then Combobox5 will = to "A, B, C, D, E, F"


How would I make this happen?

That is most impressive :D

Thank you xlbiznes