To accept a payment from a group/business you will need to go into the group record first.
In the group record you will have a button called 'Actions' that will bring up a drop down list of a number of different options. In here you will see the option for 'Add Payment' which is highlighted below.
When this is selected this will bring up a pop up window to add in the payment.
In here you will need to enter in the Account Name, Reference, Date, Paid By, Payment Type, Notes and the amount. You also have the option to either print or email the receipt for the payment.
This payment will then be added on to the group account and will be unreconciled.