PD_MODIFY_DIMENSION command
+-------------<------------+
v ^
-->(PD_MODIFY_DIMENSION)--+--(IMMEDIATE)--+--+--|sel dim|--|new value|--+
| |
+--(DEFER)------+
PD_MODIFY_DIMENSION sets a new value for a parametric dimension. Parametric dimensions are created when COPILOT is on, and they are displayed with PD_MAKE_DIMENSIONS.
IMMEDIATE indicates that all geometry should be updated as soon as the new value is entered.
DEFER indicates that the value of the parametric dimension should be changed, but the geometry should not be updated until later. In other words, DEFER allows several parametric dimensions to be modified at one time. Performance is improved, because the model is not updated several times. In some cases DEFER is necessary because some groups of modifications do not have valid intermediate geometry.