First set up the Owners Group contact, and individual 'Owner' contacts for each member.

Open the Owners Group contact, and select 'Owner Group Members' on the left menu, select 'Manage Owner Group Members'. 

Enter each owner group members name, it will match to the contact you have already created.  If the share is a % split, enter each members share in the Percentage field on each line.  If the owner contact has more than 1 bank account, check that the correct one is selected for this Owners Group.

If the funds are to be split by amounts, rather than %, or a combination, click '+ Add Fixed Amounts'. This page opens the option to prioritise disbursement, in this example Bernice will be disbursed 50% of funds first, then Charlotte.