cell colour formatting with multiple arguments

Hi all,

I am creating a spreadsheet with milestones in sheet1 and tasks for these milestones in sheet2.

I would like to create a rule that:

- If all the tasks for a milestone in sheet2 shows TRUE, then change colour of the milestone in sheet1 to GREEN.
- if one or more of the tasks for a milestone in sheet2 shows FALSE, then change the colour of the milestone in sheet1 to AMBER.
- If all the tasks for a milestone in sheet2 shows FALSE, then change the colour of the milestone in sheet1 to RED.

For example, there is a milestone cell called Patch Cables is in sheet1. In sheet2, there are 3 tasks for the Patch Cables milestone. If these tasks all show TRUE, then the colour of the milestone Patch Cables in sheet1 is automatically changed to GREEN. If one or more tasks shows FALSE, then the colour of the milestone changes to AMBER automatically. If all the tasks show FALSE, then the colour of the milestone stays RED as the default colour.

How would I do this?

Thanks