Clear as mud.

If you're referring to range offsets within the document (e.g. With ActiveDocument.Range(Start:=50, End:=150).Find, where LowerLimit = 50 & UpperLimit = 150), this all becomes problematic once you start working with ranges that span fields, tables, etc.; even more so when the Find/Replace strings don't have the same lengths - the first such Find/Replace immediately invalidates the offsets for any Find/Replace that works with content deeper in the document.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]