Giving view or edit access on Projects based on Customer

Summary:

Dear Team,

We assign a project to the project manager based project where it has services, or hardware or licenses etc..., we want another team leader to view/edit these projects ( the team leader should have access based on customer), if customer is ABC then he should view or else he shouldn't'.

how to give access to user to view/edit based on customer. For example, if a project is for customer ABC and project manager is already assigned to it. another team leader should view this project as customer is ABC, if customer is XYZ then this team leader shouldn't view this project.