Multiple Limit/Stop Orders

Please allow for multiple orders to be placed on a chart. For example, if someone enters a buy order at 18,300 on NQ, and has a stop at 18,280 and then adds at 18,320 and wants to put a stop market for that order alone at 18,300 - they cannot with how the platform currently is unless they can put in a stop limit. Also, will the platform liquidate on a FIFO or LIFO basis? That is also important.