Inventory that calculates between forms.

Hi,

I currently use the inventory widget on my forms.   I currently have a 'Book child' and 'Book Adult' form.  Now this is great when I'm doing separate courses, but when I am then doing a joint course with both adults and children, I was wondering whether I would be able to get the widget to realise a place has been taken on the adult side, that it also reduces a place on the child side, so then I only need to place the total number of places available in. 

Can this be done?

Thank you.  

Unfortunately, if you are using separate inventory widgets for each form, there is no way we can dynamically deduct the selection from a widget to the other.

I'm afraid the only possible way is to manually monitor the slots for the said Joint courses and manually reduce the widget's remaining balance once a selection is made to the other widget. This can be done by either submitting a dummy registration or deducting one slot from the widget's settings.