After creating a project, you may want to store history entries to it.

This is just a simple communications history, but to the projects.

By clicking on the plus sign, you can enter the history entry:

Here you can choose the same kinds of fields as the standard communications history, but in the contact history you have to choose from the contacts added to the project:

The milestone part of the history comes in when you use milestones. If you do, here you can set up to which milestone this particular history entry connects to.

When you are finished click OK.