I agree with @blandb that you should be looking at content center for these standard shapes, but for any parameter that you want to include in an iProperty you just have to export the parameter to a custom iProperty and then you can reference those properties in other ones.
Here is an example with a square tube that I set up in Content Center. Just click the box on the export parameter column for the ones you want to reference.

If you right click on one of the parameters being exported and select custom property format you will get options for changing the precision, including the units, leading & trailing zeros, etc.

These parameters will then be included in the custom properties.

To reference them in other properties, start your text with an equals sign and enclose the property name in the less than and greater than symbols.

After you click the apply button or hit enter it will change the names to the values of the parameters and add the fx symbol next to the property. Then whenever the parameter changes, so will the iProperty.

Andrew In’t Veld
Designer / CAD Administrator
