Bank Reconciliations - Multiple Companies

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Hey Sage gurus!

Hoping there is a work-around. Our company has sister companies, and they all have their own Sage company codes with separate books, G/L accounts, etc.

However, the three companies all use the same bank account. How can I go about doing a bank reconciliation in Sage 100 if the bank's beginning and ending balance is really split across the three companies? 

Any ideas? Greatly appreciate the help! 

Cheers!