Based on the information provided in your query, it’s definitely possible to include multiple packages within a single project, you would just need to include a separate Deploy Package step for each of the associated packages.
We are currently working on allowing multiple packages within a single step (to reduce the number of steps required) in addition to allowing a package to be deployed alongside a script step.
I’d recommend keeping up to date with our Release Notes to be aware of this feature introduction.
If you require any further assistance or clarification, please let me know