Merge pdfs and convert csv to pdf

Hi everyone,
I want to add the data in a relationship in table form in a preexisting pdf.I am thinking making a csv from relationships than converting to pdf using some libraries and then merging both the pdfs.I tried itext7 but aras toolbar disappears when I use the dlls.I tried Spire too but the pdf generated is not looking good.Any have a suggestion or have done something like this,Please let me know.You will be of great help.

Thank You.