I understand that you want to access and control the ‘Bus ports’ parameter from action bar in a ‘Bus Creator/ Bus Selector’ programmatically.
The number of input ports can be initialized using the ‘Number of inputs’ parameter in a ‘Bus Creator’. The following lines of code can be used to set and get the input parameter of a ‘Bus Creator’ programmatically.
set_param(gcb,'Inputs','element1,element2,element3,element4')
get(gcbh,"Inputs")
The ‘set_param’ sets the input parameters and the incoming elements to the bus, thereby varying the number of input ports. The ‘get’ method called on the ‘current block handle’, indicated by ‘gcbh’, gives us the current number of input ports of the ‘Bus Creator’.
For more information about the parameters of a ‘Bus Creator block’, refer this documentation page: https://www.mathworks.com/help/releases/R2020b/simulink/slref/buscreator.html#mw_0b4c698d-d93d-4b10-8bca-8ae11894f317
Hope this helps!
