Need column calc to filter out results of another custom column calc

[DeniseCo1]

I created a new column to determine if projects were created with a new project template, or an old project template (if statement).  Our new project template has 19 tasks on it, but the old one had a lot more. 

This is the calculation I'm using::

displayname=Less than 20 Tasks = New Template
sortType=desc
textmode=true
totalTaskCount_Mod=lt
valueexpression=IF({totalTaskCount}>20,"Old Template","New Template")
valuefield=totalTaskCount
valueformat=HTML

This works great.  However now I need to filter out anything that is classified as "Old Template".  Since this is setup as a custom column calc, I can't format on it.  I also can't group it. 

How do I filter out all the items that are classified as created with the "old template"?

[Madalyn_Destafney · Accepted solution]

Question, is the new and old template the same template just revised? If they are two different templates, even if one is now deactivated, you could use a project report and group by template?