link cutlist to custom property

I do a lot of assembly of sheet metal.  In my BOM I need to use the cutlist ( width, lenght..) information without have 2 lines for each part ( making by the indented option ) .

I see only 2 way. First, use the INdented option and delete each Part Only line. The second way, by copying the cutlist property a want to the part custom property and use the PART ONLY bom.

I prefer the second way to reduse the risk on error.

My question is, there is a way to link the cutlist pproperty to the model custom properrty in a way that is updated when the value change??

I know how to make macro to make what i want, but  i have to run my macro each time.

I see a video  with MACRO FEATURE can make this, but a don't know how to upgrade my macro to a macro feature.

Did some one have a tutorial???  A macro feature is the same thing of a Custom feature??

SolidworksApi macros