How do I setup a new field that allows you to select only certain values within another sub field?

How do I setup a new field that allows you to select only certain values within another sub field?

Example:

Field 1 drop down has 2 values

F1Value 1 = A

F1Value 2 = B

Field 2 drop down has 4 values

F2Value 1 = 1

F2Value 2 = 2

F2Value 3 = 3

F2Value 4 = 4

When I select A in Field 1 I want Field 2 to show only 2 of the 6 drop down values within the field (values 1 & 2)

How do I do this in a template ?




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