Progress % for complex projects

We are currently using Wrike as our PMO tool. We have portfolios, programs and large projects. Currently our large programs have multiple projects within them. They also have sub projects within them, however requirements are not clear across all projects within a project. 

E.g. Project X has 7 Minimal Viable Products, therefore 7 Projects within Project X. 
Project 1 is 99% complete.
Project 2 is 40% complete.
Project 3 - 7 has no data in but is captured. 
The main progress on Project X is therefore around 65% but that is not the case as the bottom 5 projects have not been taken into account. 

Can we add one more measurement at project level to measure the progress based on project timelines or do you have other ideas that can be used instead of task duration average and completion? Will that solve our problem?