Quote:
Originally Posted by theducks
You don't transfer those because they are consstructed from other data.
What you need to do is Create those columns (with formula) in the destination.
2.5 ways
1) Create the/a Library with the copy STRUCTURE option. Then add books
2) Copy the formulas to Notepad (copy from the edit part of create custom columns, paste into a notepad (txt) file, later paste into the new column created from: formula area
2.5) Use a pencil to take notes and type those in 
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Just thought there would be a more easy way since normally you can do everything with calibre.

Mostly the problem beeing more that you don't kow that you actually CAN DO what you want to do with calibre.