As all transactions are generally in cash, you wouldn’t need Customers, Sales Invoices, Suppliers, Purchase Invoices and associated quotes & orders.
The main ones in addition to the default four would be
Cash Accounts - for the trading accounts
Inventory Items - for the shareholdings
Special Accounts - to group particular items
Capital Accounts - representing the sub-business (or alternatively direct BS Accounts)
In addition you need to review particular items under Settings, such as Inventory Locations, chart of accounts and perhaps capital sub-accounts.
The biggest consideration is setting up the P&L due to the different income sources
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