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I have two, possibly more, ADIF logs from prior logging programs that I wish to combine within RUMlog. I suppose I could concatenate them externally and import them. However the files have overlapping dates. Similarly, I might wish to enter manually data from old logbooks. My question concerns whether it is possible to have the imported file follow sequential dates. Is there are procedure for this? Again, thank you.

Don't worry about this. Import or enter QSOs in a sequence ever you want.
Take care when you have duplicated QSOS in different ADIF files: In the ADIF import window is an option you have to select to avoid importing dupes. This will increase the time needed a bit.