To merge branches up to a specific commit in Git, you can follow these steps:

1. Identify the Specific Commit:

•    Use `git log` to identify the commit hash you want to merge up to. Take note of the commit hash or copy it.

2. Switch to the Branch You Want to Merge Changes Into:

•    Use `git checkout <branch>` to switch to the branch where you want to merge the changes. Replace `<branch>` with the name of your target branch.

3. Merge the Branch Up to the Specific Commit:

•     Use `git merge --no-ff <branch-to-merge> <commit-hash>` to merge changes up to the specific commit. Replace `<branch-to-merge>` with the name of the branch you want to merge, and `<commit-hash>` with the commit hash you identified earlier.
•    For example:     

  git merge --no-ff feature-branch abc1234

           Replace `feature-branch` with the name of your feature branch and `abc1234` with the commit hash.

4. Resolve any Merge Conflicts:

•    If there are any merge conflicts, Git will prompt you to resolve them. Use `git status` to identify conflicted files and resolve them manually.
•    After resolving conflicts, stage the changes using `git add <conflicted-file>` and commit the merge using `git commit`.

5. Push the Changes:

•    Once the merge is successful, push the changes to the remote repository using `git push`.

Here's a summary of the commands you might use:

git checkout <target-branch>
git merge --no-ff <branch-to-merge> <commit-hash>

# Resolve conflicts if any
git add <conflicted-file>
git commit
git push