Operators in Custom properties

You might be able to do this inside of a design table. DT's are Excel sheets, so all of their functions are present.

A macro could do this. I wrote a similar macro a while back that takes a pre-selected face, finds the area and writes to a custom property that is then linked to a note. If the face is changed, the macro must be rerun. The macro is handy for extrusion profiles. In your case it would need to write two custom properties. Here is a sample:

Sub main() Set swApp = Application.SldWorks Set swApp = Application.SldWorks Set Model2 = swApp.ActiveDoc If (Model2 Is Nothing) Or (Model2.GetType swDocDRAWING) Then Exit Sub End If Set DwgDoc = Model2 Set SelMgr = Model2.SelectionManager Count = SelMgr.GetSelectedObjectCount If Count 2 Then swApp.SendMsgToUser "PLEASE SELECT ONE FACE." Exit Sub End If Set selview = SelMgr.GetSelectedObject5(2)

'***get section properties*** sectprops = Model2.Extension.GetSectionProperties2(selview)

'***get area from properties convert to in from m round to 3 decimal places*** area = CStr(Round(sectprops(1) / 0.0254 / 0.0254, 3))

'***create a custom property in the Drawing*** retval = Model2.AddCustomInfo3("", "CS AREA", swCustomInfoText, area)

Model2.EditRebuild3 End Sub

One way you can do it is to add a couple of extra sketches/equations to the model and then put this into the custom property of the part. This will then update should the model update. We do this for stock sizes