Click on a suitable HQ (the ones that allow the indirect fire box on the UI to be available). Then click on the indirect HE box
Then select the IF/CAS you require and the type of round HE/ICM/smoke (with the CAS you can select the platform and delete weapons you do not wish to use. Warning, the AI is bomb happy and will go for overkill).
Once you have selected the platform and weapons click on the map to target areas or point targets). Most HE will have the the HE icon as the centre of the CEP of the strike, and fire will scatter considerably if unspotted and unregistered.
Check the IF/CAS roster to see how long your request will take to arrive (done as fractions of or whole turn delays)
Sit back and wait. You do the same for UAV's or recon flights, where your plot recce orbits for the intel platforms. Don't though forget to cancel missions, I lost the best part of a mech infantry platoon because I forgot the A-10's were still hunting!!
You can adjust the fire (use the HE UI arrow button) which allows you to redirect the fire within a certain radius at a penalty to time of delivery.
Counter battery fire is available to units not offering support and can result in temporary or permanent removal of tubes, depending on the proficiency and technology available.
Some of the smaller scenarios are ideal for learning, or you can create your own set up quickly.
It does have limitations, especially with the IGOUGO system, but it's range, with scenarios ranging from parachuting Spetsnaz in 80's Afghanistan, to fighting future drug cartels is amazing.
