I need to print (already have preprinted 2 per page forms) 6 part W-2s from Quickbooks Online Payroll. I can't figure out how. Only option getting are 3 or 4 per page.

Welcome to the Community space, @mariescafe. I'm here to provide insight about your W-2 form concerns in QuickBooks Online (QBO).

The 6-part W-2s are currently not supported by QBO. Rest assured, you can easily obtain this form by ordering it through the IRS or online sellers. You can then print the W-2s outside of QBO using the form you obtained. 

For more details on other payroll subscriptions, please refer to this article: How to print W-2 forms.

Let me know if you have further queries about your W-2s. I'll be here to provide assistance in any way I can. Take care.