Index/Indirect/Match Help

Hi
I am trying to develop an Excel 2007 workbook to keep track of various projects. The workbook (attached) has five tabs:
ProjectSummary - a brief executive overview
Timeline - a Gantt chart of the resources for each project
ResourcePlan - A list of projects, with the resource requirements for a particular month
BudgetResourceDays - list of resources and the total usage for a pacticular month
BudgetResourceCostSumm - list of resources with total cost for a particula month

I am trying to develop the Timeline/Gantt chart. For example, the Online Forms project uses rows 5 to 16 (last blank cell in column A) in the ResourcePlan. I currently have to copy/paste the calculation in (eg =SUM(ResourcePlan!G5:G16) etc).

I think it should be possible to look up the relevant rows in the ResourcePlan tab, total them using a combination of MATCH, INDIRECT and INDEX, but I haven't managed to get this to work.

Any ideas?

Regards
Robert

If you can place some text (an "x" or something in A135 of ResourcePlan to mark the end of the data, then in Timeline!G4 enter:

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copied down and across.