PMI dimensions can be placed into a part or sheet metal file from the assembly level using the Create in Model button on the Smart Dimension command bar.
Note:
The assembly, part, or sheet metal model must be activated in an assembly. Only dimensions placed on synchronous geometry can be driven dimensions.
Set the Select Tool to Face Priority.
Choose the PMI→Dimension→Smart Dimension command.
On the command bar, select the Create in Model Button.
Select the component object (edge, face etc.) to place the dimension.
The PMI dimension is placed in the component.
Tip:
Once the PMI is placed, the Create in Model mode is turned off. It has to be selected each time you place a dimension PMI in a component from the assembly level.