Custom Format Code for Pivot Table - Excel 2010

I am using the following custom format code for my pivot table:

[=1]"Full";[=2]"Ltd";"None"

I need to update it to this: [=1]"Full";[=2]"Ltd";[=3]"None";[=4]"NS"; "Closed"

I keep getting an error message.

Is there another way to do this outside using a custom format code, even though I think it’s the easiest. I am also open to using VB code.

This is a copy of the spreadsheet I’m using so you may not see the code.

thanks