You can chose to enforce strictly even input/output product ratios. If you enable strict output ratio, products will be output to all output ports evenly. If a port cannot accept any more products, output will pause until the port gets freed-up. Input strict ratio works in a similar way.
You can chose what ports to prioritize. If you enable output prioritization, all products from any input will be first attempted to output via the prioritized port. If that port cannot accept any more products, the other non-prioritized port will be used. Input prioritization works in a similar way.
Assigned vehicles will be allocated to transfer cargo exclusively for this building. This means that anytime an assigned vehicle performs a delivery this building has to be either source or destination of the cargo. This can be combined with routes assignment to form dedicated supply lines.
Assigned excavators will automatically mine all the mining designations managed by this tower. Don't forget to also assign some trucks so the excavators can unload their shovel.