When I do an ACH payment, do I do the same thing as I do when printing a check except I'll take the Electronic option instead of the Check option?

An ACH payment is different from EFT payment.  If you need to send a transmittal to the bank to pay the invoice that meets NACHA requirements, it is an ACH method.  

If you are just doing an online payment, say for taxes, you would use an EFT payment method.  

ACH works like this:  https://us-kb.sage.com/portal/app/portlets/results/viewsolution.jsp?solutionid=232425080900047&hypermediatext=null (save the file it downloads and follow the directions.

EFT works like this:  https://us-kb.sage.com/portal/app/portlets/results/viewsolution.jsp?solutionid=223924350032580&page=1&position=7&q=EFT%20PAYMENT 

I have the same question.  The ACH pdf you reference is exactly what we have done as well.  However, it is keeping electronic payments (not EFTs) on the AP Aging.  Why?  How does that change?

I have the same question.  The ACH pdf you reference is exactly what we have done as well.  However, it is keeping electronic payments (not EFTs) on the AP Aging.  Why?  How does that change?

There are a number of possible reasons.  See:  https://us-kb.sage.com/portal/app/portlets/results/viewsolution.jsp?solutionid=223924850045693&page=7&position=4&q=ach%20payments%20still%20show%20open  

Most of these explain either something was left in the discount, the retainage, or the distribution.