It already added the cost of the ammo when I bought that. I'm watching my nuyen drop by an additional 1200 when adding clips in this way. I add clips by themselves and it doesn't do this.
Ok, I'm going to need a bit of information so I can try to duplicate this. What kind of ammo and how many in the clip first and fore most. Next, creation mode or career mode (the behavior is different)? Beyond that, I want to make sure I have the order of events right so I'm going to list what I think you're telling me so you can point out where I've gone wrong...
- Add a spare clip (5 nuyen)
- Add ammo as a plugin to the spare clip (presumably 1195 nuyen)
Now for number three, there's a few possibilities. If you are in Create mode and select the clip then use the Qty box to the right to increase the quantity, it should charge you for a new clip and another set of rounds to fill it. If you are in Create mode and click Add Gear to add a new clip, it should charge you 5 nuyen for an empty clip. If you're in Career mode and select the clip and then click the green plus button on the right to buy more ammunition, it will pop up the select gear dialog... if you then select the spare clip again, it will add a full extra clip AND the rounds for it.
And then there's option number four and this is probably what's happening... if you are in career mode, have a clip with rounds in it, click Add Gear, and then select Spare Clip. Two things can happen here... By default, there's a check box on the Select Gear dialog labeled "Stack". If you click Ok with this checkbox checked, it assumes you're wanting to stack this item with the others you have. So it will find you have a clip for that gun and it has rounds in it and will buy the new clip and the rounds to go with it and increment the number of clips of that type that you have. If you uncheck the Stack checkbox, it will buy a brand new clip marked for that firearm but with no rounds in it and it will list it separately.
If you're getting some other result or going about some other set of steps, let me know where you're getting different results and I'll do my best to figure it out.