MIMO beamforming using phased array system toolbox

I want to implement beamforming of MIMO or Massive MIMO system using phased Array System toolbox.

Currently, I have implemented beamforming simulation based on the example provided by matlab, but I would like to implement the follows..

'Perform phased array (URA) transmit antenna selection.'

... To do this, the number of selected antennas will change flexibly,

and I wonder if it is possible to work with a phased array antenna.

We would appreciate it if you could leave any examples or advice related to this.