How to add configurable parameters for a Merge Module

If you want a merge module to have parameters that can be configured when the module is imported into the main project the following steps must be followed:

1. In your Merge Module project go to Custom Actions Page.
2. Select your defined custom action.
3. From the context menu select the "Configurable" option and "Target" or "Source" depending on what type of parameter you want to set.
4. The Edit Substitution Parameter dialog will appear where you can declare your parameters. For more info on how to create a Merge Module with configurable parameters for the attached Custom Actions, please see the tutorial: Create MSM packages with configurable parameters for custom actions