Use bomb counter instead of arrow counter

[Fullmetalryuzaki]

So I'm working on a quest where there won't be use for bombs but as a side-weapon that uses a slingshot... And slingshots don't use arrows XD so I thought... Bombs! Rupee counters and magic counters are already in use. So how do I achieve?

[XMuppetSB]

Again, this is something that can only be done with scripting. If you want to add any features that require scripting, you may want to learn how to script, or if you're not willing to do so, ask someone who knows a thing or two about scripting to make a script for you.