Percent complete of project....

All;

I've been asked to graph the percent complete of a project in P6. The project has a total duration that it must meet. The simple, linear way, would be to just graph the schedule percent complete on the linear total duratino and call it a day. We don't want to do it this way becasue we believe the activities or the summary bands/phases that they belong to, should be waited - ex. 24 month total project duration, demo/abatement is considered 10% of the project (i.e. 2.4 mos). If the demo is projecting to take 3 months to complete, would we simply should the demo/abatement phase "below" the linear line? The other question is, once we determine how to weigh each phase, etc. will p6 produce this graph or will we need to dump out to excel, etc.

Any feedback provided would be appreciated. Thanks.