Add an Accounting Unit
	Step	How to	Is Required?
	1	Select Cost Center	Yes
		Mark the checkbox to indicate if the AU is a 'Central Accounting Unit' (i.e., records entries on behalf of other AU's)
	2	Select sub-accounts for the new AU	Yes (at least one sub-account)
		Select 'Main Catalogue' first, then sub-catalogue. The listbox is populated with the sub-accounts of the selected sub-catalogue.
		Use the 'Add' key to select a sub-account into the AU's list of sub-accounts.
		Likewise, use the 'Remove' key to remove a sub-account from the selected list of sub-accounts of an AU.
	3	Save the selected sub-accounts of an AU.
		Note:
		An 'Accounting Unit' (AU) is a mechanism to configure multiple accounting offices of a company, as with brnaches at different geographical locations. Each AU has its own sub-accounts corresponding to banks, petty-cash, customers, suppliers, staff, etc. and maintains its own set of books.
		System users are assigned to AU's so that they record accounting entries for that AU and monitor finances and report to higher level amangement.
		An 'Accounting Unit' corresponds to a cost center. Only a cost center can have an 'Accounting Unit'.
		For each AU, the necessary starting sub-accounts are assigned at the the time it is created. At a later time new sub-accounts may be added to an AU.
		There is a special AU that can also reocrd entries on behalf of other AU's in addition to its own. This is in many cases the central (Head Office) AU and it is named the 'Central Accounting Unit'.
		Sub-accounts are grouped at two levels, by a main catalogue first and by sub-catalogues under each main catalogue. A sub-account is a member of a sub-catalogue. A bank account may have a 'Project bank account' as its sub-catalogue in a setup where 'Banks' is the main catalogue.
		Different branches may have different sets of suppliers, staff or customers in the real world.