Often you can insert some form of documentation in any segments that have been inserted etc. Once you have a synced documented copy upload the data register values preferably with the system in run but the machine or plant in a idle state. If there are differences in documented copy with the PLC, take & upload do a compare & then manually go though the code side by side & modify your documented copy as any extra segments may cause the comments to go out of line (had to do this on Siemens although it is pretty easy but long winded). If you do I suggest you do not overwrite the original but make a copy, verify the copy with the PLC then upload it to the copy. If you do not have original documented copies then definitely upload everything if possible. Not used CX IDE but experience on many other platforms I suggest the following.
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