Sometimes, you may have different areas all scattered throughout your world.
Here is the problem: you want access to your Refined Storage system on all of those areas.
Simply craft a Network Transmitter and connect it to your Refined Storage system in your main base.
This block will take a LOT of energy (of course, this depends on the config file and the distance between your base and the area, but generally speaking...), so make sure your power situation is OK.
Next up, craft a Network Card. I'll be telling what you need this for in a second, bear with me.
And now you are done. Simply connect machines to your Network Receiver according to the normal machine connecting rules.
What if my other area is in another dimension?
You do the exact same process. There is one big difference: the power cost and a neccesary upgrade.
When the Network Receiver is in another dimension it no longer calculates the power cost based on distance, but it'll have a fixed power cost of 1000 FE/t.
One very important thing to note
After linking, both areas have to stay chunkloaded.