Reflexive feature for Lan-Lan rule creation supposed to be there in Sophos Firewall as like cyberoam
As I recently noticed while creating Business rule to forward port that if we select "create reflexive rule" it doesn't create rule for Lan-Lan access as cyberoam does have that.
So request you to kindly add this feature in future upgrade. it helps to optimize time and have clarity for the same.
This will be addressed in version 18.