Is there any need to create the packages in plesk?
When we create a package in MB for the Plesk server then there is no need to create a package in Plesk. We use the package attirubtbes in Modernbill and pass those via API. If you want to match the attibutes then no you either have to do it in the way described above or have to do it in your own way w/o using Modernbill.
There is no need to setup a package in Modernbill and a package in plesk, you can setup a package in Modernbill and that is the only place that there needs to be a package. There does not need to be the same package setup as a template in Plesk.