Split Company file into two files

Hi

We currently have one Reckon file which covers basically two entities.

However, our accountant wants us to split our Company file in two, ie have two company files (one for each entity). We want to do this sometime in 2021 before 31/12/2021. We're thinking of creating two new company files.

Obviously, this will be a big job, so looking for advice about this process and the easiest way to go about this. eg:

. date to split - suggestions, reasoning, ie 1/7/21 or other date in 2nd half of year eg 1/8/21 or 1/9/21. our EOFY is 31st December.

. any advice from people who've done this before (do's & don'ts)

. where to look for good advice on the process which is not a huge cost

. checklists (I've started a list eg. memorised transactions, reports etc)

Thanks

Debbie