Mark - Thanks for the input. :)
viret56,
Just as Mark said, this would be a tall order, and unfortunately beyond the scope of help we could provide over the forums. His suggestion of dynamically filtering a grid of estimates I think is the best suggestion. This will allow you to see some details about the estimates before viewing them in the Estimate screen.
I'd just include a select link that will show the hidden section containing the estimate grid and save the active recordID from the select link into a shared result. The just create a filter view on the estimate grid for the shared result.
Let me know if you have any questions.
Adam