Create custom entities, create relationship and add subgrid on form in Dynamics 365

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In this video we will create custom entities, create relationship and add subgrid on form in Dynamics 365.
Scenario:
There would be multiple project managers and each project manager has multiple developers. same developer can not work for more then 1 project
Steps:
1) Create Project Manager entity
2) Create Developer entity
3) Create 1 to many relation from "Project manager" to "developer" entity
4) Add "Developer" subgrid on "Project manager" form
5) Test
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