PDF Bookmarks remain after being split

Receiving a PDF file that has a bunch of PDF Bookmarks.
We need to split the PDF by account, which works will using the PDF Splitter.

The only issue is that all of the PDF Bookmarks remain in each of the resulting PDF files.

Is there anyway to remove the watermarks, either all of them prior to splitting or during the splitting?

I only know use external program like PDFTK on workflow as commandline.
if used like [pdftk A=input.pdf cat A1-end output output.pdf] before (even after) split PDF that will remove all bookmarks in pdf.