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OfficeJet Pro 8620

I would like to add a custom paper size.  I've been through all of the help pages but can't find an answer.  i tried to add a paper size by going to Settings, Printer & Scanners, select the printer, and click Manage.  Then I select Printing Preferences, click on the Paper/Quality tab and hit the down arrow under Media (HP Advanced Photo Papers).  I understand there is supposed to be a "custom" option there, but it doesn't exist when I do that.  

 

Do I need to go into Regedit to add something to my HP Officejet Pro?  I do have TWO HP Officejet Pro 8620 printers on that list.  Should I delete one of them?

 

Thanks!

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