multiple PRD systems with one development in CHARM

Hi Team,

Here is a scenario:

1. One DEV system => DEV(1)
2. Two Q&A systems => Q&A(1 ), Q&A(2)
3. Two Pre-PROD systems => P-PRD(1) , P-PRD(2)
4. Two PROD systems => PRD(1), PRD(2)
5. One ChaRM Project

2 landscapes (assigned to the one ChaRM Project) will look like that:

1. DEV(1) -> Q&A(1) ->  P-PRD(1) -> PRD(1)
2. DEV(1) -> Q&A(2) ->  P-PRD(2) -> PRD(2)

now my client want to implement the above landscape and the developments will be performed for PRD1 and PRD2 in same client of DEV1.

and they want to import the transport parallel till P-PRD1&PPRD2  but they want to import the PRD1 first and later some duration they want to import the PRD2 transport.

could you please suggest where and how can we kept on hold this transport which belongs to PRD2 and release after the PRD1.

Thanks and regards

SGP.