Hi Sasi,
I am just throwing a design idea for the solution to split a Word document as follows:
1) In a Word document file, click the "File" menu.
2) Click the "Print" menu.
3) Select the "Microsoft Print to PDF" as printer.
4) Click the "Print All Pages" setting.
5) Click the "Print Only Odd Pages" or "Print Only Even Pages" option.
6) Click the "Print" button.
7) Name the file and save it as PDF in a dedicated folder.
I am not sure if the MS Microsoft VBOs cover all steps above and you may have to modify/extend them or create a new one.
I hope this would be helpful. Good luck!