How use "place and link" to copy a piece of text across a document without keeping the original paragraph style

Have you tried fiddling with "Link Options" which you can select in the Links Panel fly-out menu?

At the bottom of the Link Options dialogue window, there is the "Define Custom Style Mapping" referred to by ​@dave c courtemanche

This dialogue window applies to all links whether they are text or any other format so be careful of what you change here.

Hi Brenton,

I would like to know if the steps suggested above worked for you, or the issue still persists.

Kindly update the discussion if you need further assistance with it.

Thanks,

Srishti

The advantage of using the conveyor is that it includes styling. To drop styling there are a number of options. One would be a simple script that copies the contents of a designated text frame  in the parent document to designated frames of the child document. Below is a simplified script (in AppleScript) that can get you started. For this example the text frames are both named "SharedText". The script also assumes that you only have one text frame on the master page(s). If more than one text frame per page, you will also need to name the header frames for identity. (You can name items using the layers panel.) The script also assumes the child document has a paragraph style "Head Style" for the 45pt yellow text and one named "Folio" for the headers. (You can change names as needed but make sure they are the same in the script as in the document.)  Copy the following to Script Editor and run with both documents open. Not only does the script copy the text (assuming its paragraph 1 of the named text frame), it styles it.

tell application "Adobe InDesign CC 2018"

set parentDoc to document "ParentDocument.indd"

set childDoc to document "ChildDocument.indd"

set headStyle to paragraph style "Head Style" of childDoc

set sText to paragraph 1 of text frame "SharedText" of parentDoc

tell text frame "SharedText" of childDoc

set contents to sText

set applied paragraph style of paragraph 1 to "Head Style"

end tell

tell master spread 1 of childDoc

set theCount to count of pages

repeat with i from 1 to theCount

set contents of text frame 1 of page i to sText

set applied paragraph style of paragraph 1 of text frame 1 to "Folio"

end repeat

end tell

end tell

I use this quite a bit, and dave c has it all correct. Having just figured it out for the sake of responding here, he has also demonstrated how simple it is.