The p33 expression was whatever was assigned to the Mass when you created the 'Measure Body' feature, which can be done either inside the Expression dialog using the 'Measure Bodies' option at the bottom of the dialog, next to the
f(x) option, or you can use the
Analysis -> Measure Bodies... with the Associate option toggled ON and you will get the same Measurement expressions.
As for the 'smart' COG point, that's created automatically when you create the 'Measure Body' feature (in fact, the 'Point' IS the feature), but to make sure it gets included in your drawing, you will have to manually add the Point object to the 'Model' Reference Set.
What I've done is added the required Expressions and Attributes to my default Part Templates so that if I ever need an Attribute, for whatever reason, which tracks the mass/weight of a model, most of the hard work has already been done. All I have to do is create the Measure Body feature and edit one Expression linking it to whatever p-number was assigned to the Mass/Weight value of the model. Note that depending on whether you're working with Metric or Imperial models, you will need to do things slightly different if you wish to get the normally used values for what we generally consider as being the 'weight' of an object. In Metric parts, you use the value for 'Mass', whereas with Imperial parts (AKA English units), you use the value for 'Weight'.
To help you out, I've attached copies of both my Metric and Imperial default parts with the predefined items already in place. All that I do is build my model and when I it's complete I create the Measure Body feature, go into the Expression system and edit the expression 'Mass' ('Weight' in an Imperial part) setting it equal to whatever p-number was assigned to the value for 'Mass' ('Weight' for an Imperial part) measurement expression.
As for the Drawing, once you've created your drawing, create a note where you set the value equal to an 'Object Attribute' (using the 'Relationships' option) and then select the Component in your Master Model Drawing (while in drafting, you will need to use the Assembly Navigator to actually select the Component) and select the 'Weight' attribute.
Attached are copies of my two Part Templates (they are in NX 5 format). You may also wish to look a the other default attributes which I include as well as the default display setup and so on.
John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
To an Engineer, the glass is twice as big as it needs to be.