How to: Add a Dependency to a VSIX Package
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You can set up a VSIX package deployment that installs any dependencies that are not already present on the target computer. To accomplish this, include the VSIX dependencies to the source.extension.vsixmanifest file.
To add a dependency
Open the source.extension.vsixmanifest file in the Design view. Go to the Dependencies tab and click New.
To add an installed extension: in the Add New Dependency dialog box, select Installed extension and then, for the Name, select an extension on the list.
To add another VSIX that is not installed: : in the Add New Dependency dialog box, select File on file system and then use the Browse button to select the VSIX.