Is there an element/block in OpenModelica to which we connect a signal and then use the element somewhere else to connect to the rest of the model to prevent too much wiring in the model drawing. The equivalent block in Matlab/Simulink would be "Goto" and "From" blocks as shown in the picture.
Modelica.Blocks.Sources.RealExpression from the Modelica Standard Library might be what you are looking for.
Screenshot of graphical implementation
Notice you don't need a Goto element. You can simply reference the signal source across multiple hierarchies through dot notation (in the case depicted: sine.y).