a. Yes, you can do this on the Invoice Details screen. That can be found by clicking on the Receivables Dashboard and then clicking on Invoices > Invoice Listing. Select the invoice you wish to change and click the Invoice Number to access the Invoice Details page. Click Change by the Expected Pay Date, select the new date, and enter a reason for the change.
b. If you want to reschedule multiple invoices for the same date, you can do so in the Invoice Listing section. Simply check the box next to the invoices that you want to update and select Reschedule Pay Date from the Choose a bulk action dropdown menu.