In theory you probably could split different pricing options to different sections of work. However, it would be very complicated to draft provisions that would manage that effectively and far easier, cheaper and simpler to have two separate by linked contracts.
As an example, I have seen phased contracts where there is a single over arching contract broken into, say, three phases as 1) feasibility and initial design, Option A, 2) Site clearance and remediation Option E, Construct Option C.
That works where they run consecutively with opportunities to break but running them concurrently in different site location or different types of interlinked delivery while theoretically possible would be very difficult to draft for.
As an example, I have seen phased contracts where there is a single over arching contract broken into, say, three phases as 1) feasibility and initial design, Option A, 2) Site clearance and remediation Option E, Construct Option C.
That works where they run consecutively with opportunities to break but running them concurrently in different site location or different types of interlinked delivery while theoretically possible would be very difficult to draft for.