It is fine and correct for their "clause 32" revised programme to show the cumulative effect. However, their individual CE quotations should be including a programme to demonstrate the specific effects of that event so that it can be considered/assessed accordingly.
Let's say in the period we have had CE01, CE02 and CE03. Cumulatively they have (say) a three week delay. CE01 should have its own quote issued with its own programme to show say a one week delay to planned Completion. There should then be a separate programme with CE02 quotation to show the extra over effects CE02 will have on the programme that already has CE01 in it (say a further week). Finally a quote and programme should then show the effects CE03 has had over and above that of CE01 and CE02(which is say one more week). Each programme issued with the quotation is NOT a programme issued for acceptance - it is issued to help the quotation by understood and agreed.
This also means that the accepted programme that in this case will show planned Completion moving by three weeks due to the affects of the CE's can be accepted before the CE's are agreed without compromising liability. In this case "planned Completion" will have moved three weeks beyond "Completion Date" (assuming they were the same date before), and then Completion Date can then move as and when the individual CE's are agreed and implemented.
At the end of the day the Contractor should be looking to be prove to you the effects of compensation events. If you don't understand when they are just shown altogether you are unlikely to agree so they should do anything in their control to present these in a way that you do understand and are more likely to agree.
Let's say in the period we have had CE01, CE02 and CE03. Cumulatively they have (say) a three week delay. CE01 should have its own quote issued with its own programme to show say a one week delay to planned Completion. There should then be a separate programme with CE02 quotation to show the extra over effects CE02 will have on the programme that already has CE01 in it (say a further week). Finally a quote and programme should then show the effects CE03 has had over and above that of CE01 and CE02(which is say one more week). Each programme issued with the quotation is NOT a programme issued for acceptance - it is issued to help the quotation by understood and agreed.
This also means that the accepted programme that in this case will show planned Completion moving by three weeks due to the affects of the CE's can be accepted before the CE's are agreed without compromising liability. In this case "planned Completion" will have moved three weeks beyond "Completion Date" (assuming they were the same date before), and then Completion Date can then move as and when the individual CE's are agreed and implemented.
At the end of the day the Contractor should be looking to be prove to you the effects of compensation events. If you don't understand when they are just shown altogether you are unlikely to agree so they should do anything in their control to present these in a way that you do understand and are more likely to agree.