This is a somewhat new request, but I am also going to include portions of other previously-requested posts.
Keep in mind I'm only on my 2nd Trial day.
We are Electrical Contractors, but this is likely to be relevant to any trade.
In regards to Takeoff / Item Templates and associated Product updates:
Additional Requests (that may or may not already exist as requests):
Wow Colby, you have great ideas! I will forward these to the developers.
You could use Custom Properties to enable project level Sales Tax Rates. You could also add your Sell Price feature this way.
https://www.youtube.com/watch?v=Yyr1k-EUQ90&t=9s
Stephen, thanks for the info regarding Sales tax and Sell Price, I'll look into that.