What expression are you trying to enter? You should be able to enter it in the dimension or you could make a parameter. Help on parameters here.
Mark
Mark Hughes
Owner, Hughes Tooling
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If the dimension is in the current sketch just click it and it will be assigned for you. If it's in a different sketch, edit the sketch and mouse over the dimension and you should see something like d2:10mm, d2 is the dimension's parameter you need.
Mark
Mark Hughes
Owner, Hughes Tooling
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