i mean that you should be able to use the belt as an alternative path to another factory, (example,) treecutter to treefarm and the treefarm also recieves dirt from the dirt digger (as an example I cant remember all the names of the factories)
You mean that it's not possible to split item streams onto several belts? If so then yes, splitters and filters are not yet implemented. But all the base machines are made in a way that you can build factories without that.