You can't group deployment packages yet. The easiest way to do it would be to create some custom reports.
- A report which lists all assets with none of the software.
- A report with asset which have part 1 of the software.
- A report with assets which have part 1 + 2 of the software.
- Etc.
By creating a deployment schedule based on these reports, you can let Lansweeper install all the parts of the collection one by one. Deploy part 1 on report 1, deploy part 2 on report 2, etc.