Can I add,... circuit's to fuse block ?

[Tommy]

I hope I understand your question correctly. Assuming I do, here's my answer.

Each circuit (e.g., electric fan) has at least five elements. It starts at the power source (e.g., positive terminal of battery), includes an on/off switch, a fuse or circuit breaker, the device being powered, and ends at the ground (e.g., negative terminal of battery). A fuse block is just a convenient way to group the fuses for several circuits in one location. If you want to add more circuits, you can add another fuse block and put it near the first one if there is room to mount it. The circuits of the second fuse block will need to be connected to a power source and ground plus the other elements mentioned earlier. If the wire(s) carrying power to the first fuse block are adequate, you could run a pigtail to the second fuse block to power its circuits. To know if that is safe to do, you'll need to know how much power each circuit will carry and how much capacity each was designed to carry. If running a pigtail is not possible, you can just run power to the second fuse block like you did the first one.