Thanks for the quick replies guys. Haven't had time to try to make an IED again, been making the mission tasks and triggers which, it turns out, is super easy once you know how it all works!! Anyway, thanks for the advice. I'll try out tomorrow afternoon, see if I can get it to work and report back on my success. Who knows maybe I'll even upload the mission someday haha!
EDIT: I was actually wondering how you can make a task appear AFTER you complete a previous one. For example in my mission you have to destroy a weapons cache then RTB. The task is complete when the weapon cache is destroyed. I mean it's not a big problem, as I can still have the RTB task active from the start but it'd make it a bit more dynamic to have it appear AFTER you complete the final task.
EDIT: I was actually wondering how you can make a task appear AFTER you complete a previous one. For example in my mission you have to destroy a weapons cache then RTB. The task is complete when the weapon cache is destroyed. I mean it's not a big problem, as I can still have the RTB task active from the start but it'd make it a bit more dynamic to have it appear AFTER you complete the final task.