In R12, Can we create two ledger, One with LE and another without LE?

Hi All,

Please help us out as we are migrating from 11i to R12. We are going through with our current setup and find out that previously consultant sets up the system as follows -

1- They have created one BG and One LE

2- They have created two SOB for two different companies of our client.

3- They defined security rules and on the basis of that they separated client's two companies.

Now we are able to post the sub-ledger transactions in two separate books i.e. SOB1 and SOB2.

Can we use the same setup in R12 at the time of migration? if yes then how and if no then what should we do?