For the developers of the Manager.io, I salute you. You have helped countless people with their businesses. Your software is absolutely perfect, but do you think that you’ll ever come up with a POS (Point of Sale) Dashboard App compatible with ios and android?
If you search for POS system in the forum you find lots discussions. Add items to invoices like POS - #2 by Tut
In a nutshell Manager is for accounting and one is advised to use a separate POS application, where summaries go into Manager.