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Is it possible to customize the default hole notes of holes (all types) in Creo Drawings?
Yes there is.
See this CS article: Article - CS28399 - How to customize the standard hole note in Creo Parametric (ptc.com)
Ben has the right answer here. If you search the forum for hol files you will find some threads like the one below were people have uploaded examples.
https://community.ptc.com/t5/3D-Part-Assembly-Design/tapped-hole-parameters/m-p/295020/highlight/true#M90143
