If a certain functionality cannot be found in the Available Blocks you have to implement it in your own block. This is also the case if you want to create aSubsystem.

If your block has one input, one output, or one input and one output, you should design your block as an extension of Block1i, Block1o, or Block1i1o, respectively.

For all other cases your block will have to define the necessary inputs and outputs as fields of your new block class.

Depending on the type of the signals you will design your class as a template class or you will define it with a given type.