Training
Module
Introduction to solutions for Microsoft Power Platform - Training
Learn how to transport an existing app and components from one environment to another.
Add an Existing Project to a Solution
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
You can add one or more projects to an existing solution. A project can be associated with more than one solution.
In Solution Explorer, select the solution.
On the File menu, point to Add, and select Existing Project.
In the Add Existing Project dialog box, locate the project you want to add, select the project file, and then select Open.
The project is added to the selected solution.
Note
Before adding an existing project from shared directories in a multideveloper environment, you should attempt to ensure that your changes do not adversely affect or overwrite another developer's changes.
Additional resources
Documentation
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Set multiple startup projects - Visual Studio (Windows)
Discover the Visual Studio process that allows you to specify how more than one project is run when you start the debugger, and create launch profiles you can share with others.
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Display line numbers for code - Visual Studio (Windows)
Turn line numbering for your code on and off in the Visual Studio code editor. Line numbers can be useful as a reference.
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Remove or Delete an Item or Project
Remove or Delete an Item or Project