Isah uses this ledger account for the journal lines that are created automatically for the purpose of cross-charging between companies. Create a separate ledger account for each individual company. This will allow you to see the receivables and liabilities between the companies from the ledger accounts.
The account you specify for a company exists in all databases, except in the database for which the account was specified.
You do not have to fill in these fields; they are only relevant for the Intercompany add-on.
These fields can be used freely. You might want to use them to specify the logo to be used when printing external documents if you have different companies. In that case, configure the reports to select the logo based on these fields.