Say I'm designing a device with a lot of repeated elements, like an 8-channel audio mixer. Each channel will have functional units that are identical and repeated, for example, an amplifier.
To keep the top-level schematic readable, my schematic capture software allows schematics to be hierarchical, where the top schematic has symbols which represent subcircuits.
What conventions are there for visually representing this? Are there conventions to give the reader of a schematic a hint that A1, A2, and A3 are not discrete components or ICs, but a circuit defined on another page?
What conventions exist for naming (for printing on the PCB) the discrete components that compose these sub-circuits? Would it make sense to concatenate the name of the symbol and the components, so in the example above I'd end up with A1R1, A1R2, A2R1, A2R2, ...? Is there a conventional prefix for the names of the symbols, A1-A3 in the example, which hints at their nature? (As C1 suggests a capacitor, etc...)