Automation/streamlining building multiple Assemblies with sub-assemblies

Hi,

Was hoping to get some help and best practice tips & tricks (if there are any).

We are currently building mutliple assemblies that are then used as sub-assemblies to build multiple other assemblies.
We realized that it is a lot of effort and time spent (in NS) to always have to build the sub-assemblies on a daily basis to be able to build the finished product within NS.

Is there a way to automate this in any way?

e.g. when we want to build the finished assembly it would automatically build the required sub-assemblies simultaniously...so that the users can focus on building the end product rather than building the sub-assemblies in NS separately (this has to be done at the factory-floor regardless obviously) but from an administrative perspective in NS it feels way too time consuming.