There are many ways to achieve this.
For example: In the first combo box implement an Event "On Change". Do some VBA coding in it to fill up the second combo box based on the value selected on the first combo box. See a VBA example below
There are tons of tutorials if you google for "access combo box based on another".
Private Sub Combo1_Change()
If Me.Combo1.Value = "value1" Then
Me.Combo2.RowSource = "val 1 based on 1;value 2 based on 1"
End If
If Me.Combo1.Value = "value2" Then
Me.Combo2.RowSource = "val 1 based on 2;value 2 based on 2"
End If
End Sub
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