blank out values in custom properties

Hello,

When I create a part, I use the custom properties to fill in the following:

part no.

description.

material.

I use them to fill in the title block of my drawing.

When I need to create a similar part to the original I use the 'save as..' function. This results in copying the custom properties too...

Offcourse the new part needs to get a new 'part no.', 'description' etc.

Is there a way to blank out the property values or to return the values to template settings.

Thanks

SolidworksParts And Features