Is there a specific reason why the block that you want to connect all of the outputs to can't be replicated in the model? For example, if you have two output signals that you want to scale by 2, is there a reason that two 'Gain' blocks could not be used?
The 'Mux' block can create a virtual vector of signals that have the same data type and this may be helpful depending on the application. The following documentation page provides additional information on the block:
You could also use a 'Bus Creator' block to create a bus signal from multiple signals as described in this documentation page:
