Welcome to the HP Support Community. I'd be happy to assist you. You may check the paper-handling specifications of the printer here.
HP OfficeJet Pro 8740 All-in-One Printer series supports printing on cardstock papers.
note: Load card stock in Tray 1 only. Card stock is not compatible for use with the ADF for single- or double-sided printing.
To know how to load the card stock papers, refer to this document.
Hope this helps! Keep me posted.
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KUMAR0307 I am an HP Employee
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