What is the difference between a "project" and a "design"?

Question

In PSPICE for TI 17.4, "File" - "New" - "Project" and "File" - "New" - "Design" appear to produce the same result: a <name>.DSN file, a <name>.OPJ file and a <name>-PSpiceFiles subdirectory.

The User Guide only mentions "File" - "New" - "Design" in connection with Design Entry HDL (which I don't expect to be using), but I couldn't find any explanation of the difference between a "design" and a "project", nor did I see any difference between the schematic editors presented by "File" - "New" - "Project" and "File" - "New" - "Design".

How does a "project" differ from a "design" in PSPICE?

AyushD · Accepted Answer

A project file (.OPJ) is a container for the design file (.DSN). There can be only one design file in a project. The project file stores pointers for interacting with the design file, other referenced files, and outputs reports associated with the design file. 
 When the project is first created, the project manager creates a design file with the same name as the project. 
 If you create a new design file, or move or copy a different one into the project, the project manager will ask you if you want to replace the existing design file. 
 You can view the hierarchy using the File tab in the project manager.

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What is the difference between a "project" and a "design"?

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