You can for example use the Interleave 1D Arrays / Decimate 1D Array primitives located in your Array palette.
If the number of channels is getting to big to be practical using the primitives, you can also try to create a 2D array (channels, elements), then transpose the array and reshape it to the 1D array you want to send. Do the opposite operation or simply extract the channels collumn-wise on the receiver side.