How do you undo a merge in ArcGIS Pro?
Are you using the tool that I posted? and I thought you wanted to undo the merge? Can you clarify what your inputs are and what you want as an output?
In the original layer all the the lines in a parcel were merged. I have another layer that contains the parcel in its original form. Can I merge or append this second layer into the original and save in the original? Append attribute tables?
Too many 'merge' options.
If you mean
Merge—Data Management toolbox | Documentation
and specified an "add_source" or some other unique field is in each table,
Then
Split By Attributes—Help | Documentation
might be able to do it if there is that field information which can be used to differentiate the original files (assuming you have no backups, I am guessing)
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