Thank you for your kind answer. I was suggesting some "additional" workarounds for some of the limitations of Citavi "Convert Placeholders.exe" , specifically:
Limitation1-If additional text is present in the footnotes it will not be moved into the main body of the text. When the tool finishes, give the converted Word document a quick look to make sure everything is okay.
To decrease the problems of footnotes references with manually added notes not turning to in-text citations: For the footnotes you think you will need to convert (with their manual added notes) into in-text citation: begin the footnote with the dummy reference zzzf and end the footnote with the same dummy variable.
For some reason, the citavi placeholders converter will move the entire footnote (even if it has manually added notes) to in-text if there is a reference in its beginning and another reference in its ending. User can use any reference but creating a dummy reference helps the purposes of revision and replacement (easy to search for and replace in MSWORD). In addition, if you don't want to start or finish your footnote with an actual reference (and still want this note to be converted to in-text in the future), the dummy variable will be useful in such cases.
Limitation2-Please also note that multiple citations in the text may be converted to multiple footnotes. In such cases, you will need to reinsert the references as a multiple citation and then delete the extra footnotes.
To decrease the problems of multiple in-text references turning to multiple footnotes:
After selecting the Multiple references you need to cite in-text, move the cursor to the end of the last reference, and then add the dummy variable zzzm. This way, when using Citavi placeholders converter, all the real multiple references will be inserted as one footnote, and the dummy variable only will be inserted as a new footnote.. It will be easier to search for this dummy variable in MSWORD to make sure that the preceding multiple references are converted correctly and to delete this dummy variable in the final copy.
I thought these workarounds may be helpful in handling long word files. Still, the easiest way might be just revising the paper after finishing as you suggest (we will need to do this any way). In all cases,it will be better of course if it is possible to integrate these workarounds (or any other solutions) directly in a citavi add-in within MsWord itself, specially for the problem of multiple citations... Thank you again for your wonderful software..