Transport 1 will deliver goods in random quantities (9 or 18) to the 'Out' locations in each round. Transport 2 will pick up from the 'Out' locations and place them at the 'O' locations one by one in order. Once transport 2 has completed placing items at the 'O' locations for the randomly determined number of rounds, transport 3 will start operating, picking up and placing items on the track. This process continues until all 11 'Out' locations are completed.
I need it to be done gradually, one 'out' at a time. How should I address this?