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That only works if you are printing the check! I don't have an option to use Bill Pay online, from there. This is especially annoying when each ACH transaction is .50, and I have 30-100 invoices to the same vendor per month! It's even worse with vendors not set up to do ACH at $1.50 per check sent!
Even if I go over to the "bills" filter by that vendor, check them, and then click on the "schedule payment" link, it will only allow ONE bill to be worked with at a time!
The new QB Billpay doesn't offer such feature. You can signup for a free Melio account to pay multiple bills (up to 20 bills) for the same vendor with ACH for free and integrate it with QBO.