First of all, we need fast-export.
git clone git://repo.or.cz/fast-export.git
then create a new git repo that we 'll use to convert the mercurial repo into.
git init gss_git_repo
../fast-export/hg-fast-export.sh -r ../gss
git checkout HEAD
Now, we have converted the gss mercurial repo into the gss_git_repo Git repo.
Then, we fetch changes from this repo into the mynetworkfolders git repo.
git remote add gss ../gss_git_repo
git fetch gss [gss_branch:new_branch]
The last option is not mandatory and is needed only if we want to fetch a particular branch from the gss_git_repo.
Now in the mynetworkfolders git repo we have a new branch containing the gss changesets. If we do a merge, all changes from the beginning of the two projects will be merged so we have a lot of work to do to keep only those changes needed. However after this step and a commit, a common node will be created in the mynetworkfolders repo, so from now on if we repeat the above procedure, only the new changes from gss will be fetched into mynetoworkfolders.