Yes you can, but this year you must have some type of strategy your using at any one time. You've got 3 strategy slots, so pick a strategy for your number one slot that you want as your default. Each match you start, will start off with your number one strategy as default without you having to change anything. So, pick one of the default ones or create a custom one for it. Then if you want to also have the offside trap and counter attack as strategies, just put one in each of the remaining slots. Then choose during the match whichever ones you want by pressing up or down on the d-pad. You'll see an icon in the bottom corner of your screen with a number telling you which strategy you've changed to.