Hi, when you have a portable solution open you can use board manager and library manager in the normal way. They will install into the solution portable areas using the standard "arduino style" folder structures. The solution simply provides a contained environment for development.

Can you try changing the IDE Selection to Arduino 2 (if its not in the list of options already, click vMicro > General > IDE Locations, select Arduino 2 and click OK if using default locations, then select Arduino 2 from the vMicro > IDE option).

Then try creating the Portable Solution again...

Thanks for the update, do you have Arduino 2 IDE installed on your machine or just the 1.x IDE?

The 1.x IDE has a different Portable route which also wraps the entire Arduino IDE into it as well (including your board package).  This is the same as in the Arduino 1.x IDE which is documented on their website below:
https://docs.arduino.cc/software/ide-v1/tutorials/PortableIDE/

Thanks for the detail.

As you are using the 1.x Portable approach, you should be able to create another project within the Portable\Sketchbook folder, and this will then use the same modified core etc as the other projects within the same Portable folder.

To allow the Teensy files to be installed using the Arduino 2 configuration, with the Portable Solution Wizard, I expect the Teensy boards are not configured for the Arduino 2 IDE to download/install.
1) Open vMicro and open the vMicro > General > IDE Locations Screen
2) Select the "Arduino 2" IDE
3) Enter the URL "https://www.pjrc.com/teensy/package_teensy_index.json" in the Optional Additional Board Manager URLs field.
4) Click OK
5) Open vMicro > Micro Explorer, and click "Check for Updates" to ensure all index.json files are downloaded.

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Currently this is not, due to it being a very specific edge case in that:

• Teensyduino is installed by an external EXE into the Arduino IDE Folder
• The Portable Solution Tool uses the package_index.json files for Board Manager to show the board packages available (which wont exist for Teensy as above)
• The Teensyduino Board Package via Boards Manager is only available in Arduino IDE 2.x

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That would work just as well.

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It downloads a fresh copy of the board package and installs it into the Portable Solution, so you would have to close VS after doing this and manually modify the files installed from your other installations.