VBA Combobox dependent pointing to range

Dear Mehmetcik,

First of, thank you for your swift answer.
There's a lot for me to check and learn from your files, thanks for that too.

I had to edit my original file for data protection and I should have mentioned it. I couldn't find the solution with what you proposed because of that, I assume.
Nevertheless, it got me thinking about another possible way and found something which currently works.
For the last group, as there's only one row in the column, the code I used doesn't work so I had to put it manually. Let's just hope I'll still work there if they ever need to add another row in this column

LR As Long

Private Sub GroupType_Change()

'Depending on the selected Group Type it picks a range from the Validations sheet
If MeetingAdd.GroupType.Value = "Group1" Then
MeetingAdd.GroupName = vbNullString
LR = Worksheets("Validations").Range("C" & Rows.Count).End(xlUp).Row
GroupName.List = Worksheets("Validations").Range("C2:C" & LR).Value
Else

If MeetingAdd.GroupType.Value = "Group2" Then
MeetingAdd.GroupName = vbNullString
LR = Worksheets("Validations").Range("D" & Rows.Count).End(xlUp).Row
GroupName.List = Worksheets("Validations").Range("D2:D" & LR).Value
Else

If MeetingAdd.GroupType.Value = "Group3" Then
MeetingAdd.GroupName = vbNullString
LR = Worksheets("Validations").Range("E" & Rows.Count).End(xlUp).Row
GroupName.List = Worksheets("Validations").Range("E2:E" & LR).Value
Else

If MeetingAdd.GroupType.Value = "Group4" Then
MeetingAdd.GroupName = vbNullString
GroupName = "Group4"
Else

End If
End If
End If
End If

End Sub