Extract Specific Data From Several PDF Invoices Which are Not In Similar Format

Dear Community,
How to extract specific data from several PDF invoices which are not in a similar format? I am attaching the sample PDFs and an Excel file, the Excel file contains the headings which needs to be extracted. Also please note that in some cases two headings that need to be extracted are in the same column that needs to be separated.
Please help.PO1.pdf (76.8 KB) PO3.pdf (24.8 KB) POP2.pdf (66.7 KB)Heading to be extracted…xlsx (8.7 KB)