How to handle many tables in ERD

Hi:
I have a schema with about 400 tables in it. They tend to be grouped into 5-10 groups of related tables. In a perfect world, I'd be able to arrange them in an ERD diagram and zoom into the appropriate area when I want to work on that section but I wouldn't have to recreate the arrangement of the tables in the diagram. I'm not aware that OWB can do this. I don't even think it can save the diagram as anything but SVG, which means every time I want to work an ERD I have to recreate it? I have to select all the tables, maximize them, arrange them each time?
How do people normally handle hundreds of tables in OWB? Do you break the large schema up into numerous smaller source schemas and only end up with the large schema after deployment?
Thanks

I meant both, actually. I'm trying to create an ERD or set of ERDs to help me figure out what I need to do in a large (to me!) ETL project. I'm using OWB to create a new target schema based on a source schema. I'll be converting VARCHAR2(2000) and LONGs to CLOBS and consolidating tables and doing other stuff. An ERD would help me visualize the current schema and work on isolated pieces of it. Does that make sense?

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