Pulling custom form data from issue to the project template

I'm new to Fusion and one of the quick wins we've identified is pulling the overall deliverable due date custom field in the issue into the project template. The goal is for the last task due date which is release final files automatically aligns with the overall due date set by the client in their request. Is this even possible and if so, what happens to the tasks if the time allotted doesn't align with the template? Any insights would be helpful to the possibility, concerns and even how to start setting this up as a scenario. Thanks in advance!