Can you trade more than one strategy in a single account?

Can you autotrade 2+ strategies into one Interactive Brokers account? Or do you need a separate account for each strategy you have an autotrade subscription to?

Also, if you have a different amount of capital than the sub, does it automatically “size you up” or “size you down?” Can you set the amount of leverage you want to use or is it automatic?

Thanks in advance!!