First you need to create an molding alias that is going to be assigned to the CLOSETROD PART

Create a profile for the new Closet Rod molding material

Then we need to create a Closet Rod Part who will have the previously created material assigned to it in all molding material schedules

Now we need to assign the material to the part in the material schedule

to assign the material in multiple schedule just Right clic on it and press change material in multiple schedule

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Next create a board material that is going to be used when adding the molding not a molding material because to get footage not length the material need to be a board material.

We will use the 1inche tube for this example

To add the closet Rod to a cabinet you need to create a new molding at the cabinet level by selecting a Profile

then select the Closet Rod Length 1 inche tube material previously created.

By selecting a molding material you will see that the molding profile is greyed out so you dont have to select a profile.