Hi Chas,
Since Numbers was first released in 2007 until now, the Numbers development team at Apple has never tried to create an Excel clone. Excel consists of huge arrays of cells with data here and there. I heard it expressed eloquently as:
Each Excel sheet is a huge "ocean" of cells with small "islands" of data here and there.
Numbers does not follow that design. Numbers allows for several tables on the "canvas". Each table can be tailored to a specific purpose and size, and moved to other sheets (example, a "Presentation" sheet). Therefore Numbers has never had a need for Print Selection, or Set Print Area, or Insert Page Break.
Again, I encourage you to browse the Numbers Template Chooser for ideas where there is no need to constantly
just select and print as you can in MS Excel
Happy Numbering!
Ian.