How to create additional sizes from Mutli-View Part - Electrical Switchboards

[bgumPXZJF]

Autocad MEP 2019. 
How can I create additional switchboard sizes from the existing out-of-the-box ones? Is there a quick way to do this? My knowledge of Multi-view Parts as well as Parametric Parts is very limited. Please help me, I've been trying to make a larger switchboard for over an hour now. 

Screen shots attached of where I am looking at. I will provide more information as requested. 

We are starting to get into more 3d jobs and I would like to implore best practices by using the Electrical Multi-vew parts that have been setup by autodesk for the BGIM information they will carry over into NavisWorks, rather than just extruding a box. 

[Anonymous]

I would insert one switchboard from the catalog, then explode it to get the basic block, next create a custom MVPart using that block and entering my favorite info... 

 

[bgumPXZJF · Accepted solution]

Thanks guys
This is ultimately how I ended up doing it. 
https://www.youtube.com/watch?v=Kzovy_E1-EA