@techzilla this page from the ATO should assist you in what is...

@techzilla this page from the ATO should assist you in what is referred to as a scrip for scrip roll over.

Basically both parties decide on what the roll over amount will be into the other company or the new company that is created as a result of the event.

If you look into Galaxy Resources merge with Lithium One that might give you an an indication how it works for one company going into another as value is assigned to the assets and then the two groups of share holders vote after the boards have come to an agreement. If there isn't an agreement then they boards go back and discuss and may re present it to the market.

https://www.ato.gov.au/General/Capi...eovers-and-mergers,-scrip-for-scrip-rollover/