Create your first List Box. Right click it and select Format control. In Input range specify A7-A9 and in Cell link select A6.
In A7:A9 write Option 1, Option 2, Option 3.
In D7-D15 (or however many you need) enter your second lot of possibilities A, B, C, D...I
In E7 enter the formula
and copy down to E8 and E9.
Build your second form and set its Input range to E7 to E9.
You may wish to change the actual cell addresses used - the above is just an illustration of how this can be done.