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A simple solution would be to map each DataStage Project to a Path that is the same name as the Project. Give due consideration to the many negative implications of having multiple DataStage projects sharing a single Git repository before adopting this approach. We won't catalogue all those implications here as we’d prefer that you just don’t do it. 
One Project, Many Repositories
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MettleCI does not permit you to map a single DataStage Project to multiple Git repositories. Some customers have multiple DataStage solutions co-resident in a single DataStage Project. In these cases customers should split their work into separate DataStage Projects representing their distinct solutions before establishing an association with the Git Project repository for each.