Can I skip through locked target with tws.

[FlyingCoffin]

so as example I have 4 locked targets can I switch which one is aimed on?

[Archer.xd]

You cannot do that in F-15C without shooting a missile to current primary target. When you shoot, it will switch to next target automaticaly, but you cant do it manually.

[draconus]

You can only undesignate the previous targets and redesignate as you wish but that's not advisable when you already have your missiles fired in TWS and not yet active.