To send an invoice from Routable, click the New > Request button at the top of the left side navigation in your Routable dashboard. This brings up the receivable creation page.
Go to the Import invoices from QBO tab to see a list of all outstanding invoices for all customers. Check the invoices that you want to pay, as well as the bank account you want all funds to be deposited to.
To send your invoices, click Create invoices at the upper-right.
Please note that, by default, since this view is for multiple customers and meant for bulk processing, you won't be able to select which contact at each company you want to reach.
📚 If that's important to you, check out this link instead.