How do I create a persistent virtual folder on windows 10?

I would like to map one folder to another virtual folder

You can use mklink in a cmd shell:

mklink /d C:\MyVirtualDropboxFolder "C:\Users\Marc\Dropbox (Company Name)" 

Notes:

• The Target is quoted as the name contains spaces.
• The above command creates a Directory symbolic link.
• See the table below for other kinds of link you might consider making instead.
• All the links types are persistent (until they are deleted).
• To explicitly delete them see "How to delete" in the last column of the table below.

mklink

Create a symbolic link to a directory or a file, or create a hard file link or directory junction

Syntax

MKLINK [[/D] | [/H] | [/J]] Link Target

Key:

/D Create a Directory symbolic link. (default is file)

/H Create a hard link instead of a symbolic link.

/J Create a Directory Junction.

Link The new symbolic link name.

Target The path (relative or absolute) that the new link refers to.

Source mklink

Further Reading

• An A-Z Index of the Windows CMD command line - An excellent reference for all things Windows cmd line related.
• mklink - Create a symbolic link to a directory or a file, or create a hard file link or directory junction.