To merge changes from the "main" branch of an upstream repository into the "design" branch of your local repository using Git, you can follow these steps:

1. First, make sure that you have the latest changes from the upstream repository by fetching the latest changes:

   ```
   git fetch upstream
   ```

2. Switch to the "design" branch:

   ```
   git checkout design
   ```

3. Merge the changes from the "main" branch into the "design" branch:

   ```
   git merge upstream/main
   ```

This will merge the changes from the "main" branch of the upstream repository into your "design" branch. Note that there may be merge conflicts if there are changes in both branches that conflict with each other. In that case, you'll need to resolve the conflicts manually.
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