RevitTricks

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don't think: Do Revit: +/- offset(s) for families : 'via Blog this' Step by step solution to +/- offset values for families. Parallel to the reference/surface point(A):   1. Create a reference plane in the + offset direction,   2. Call it "REF.OFFSET+"   3. Dimension from the reference point(A) to the plane.   4. Give the dimension a parameter "OFFSET.FRONT" (group it under 'other')   5. Between point(A) and the reference plane, create another reference plane.   6. call it "REF.OFFSET-"   7. Create a dimension between the reference plan from step 1 and the one just created in step 3.   8. Given the dimension a parameter "OFFSET.BACK" (group it under 'other')   9. In the family properties, Create a Length parameter called "OFFSET".   10. Next to the "OFFSET.FRONT"  under 'other' group, add the formula: if(OFFSET > 0', OFFSET, 0')   11. Next to the "OFFSET.B