I would like to create multiple diagrams within a single model

In Vertabelo there is one diagram for one model. If you want to divide your models into separated areas "subject area" can help. I think you omit one important functionality related to subject areas. I mean "Shortcuts". Tables, Views and References may have many graphical representations on diagram. So you can have a table visible in two different subject areas that doesn't need to be close to each other.

Here is the short video tutorial about managing large diagrams in Vertabelo  https://www.youtube.com/watch?v=a79nEA0FN1M&list=P...

The design decision in this matter wasn't simple. It is a trade-off between full abstraction (parts of model + diagrams) and simplicity. In Vertabelo we generally stand up on simplicity, this way some features known from big desktop tools are not available.

Thanks so much for your clear explanation. I was not aware of shortcuts, which is definitely helpful.

Nevertheless, I am still not seeing how this solves our needs. My model is over 100 tables in size, and it seems like your tool forces everyone to work with a view that is always 100 tables in size.

Creating different subject areas in a diagram, and placing shortcuts for related tables feels like I can break my entire model into subject areas and use that way.  But the idea of keeping all those subject areas within one huge diagram is a shortcoming -- my own opinion.  For example, I would like to print a subject area, so I can share with someone in the team.  I would like to make changes only within a subject area as part of an update to the database.  This kind of usability seems to be difficult to manage with a single diagram.

In any case, thanks again for your response and cheers on a good product -- I really wish it would fit our needs better.