add multiple items

Hello,

I just would like to add 2 items as the input for 'force objects'. As soon as I connect the second item, the first item is disconnected. Maybe it is very simple question, but can somebody tell me the solution?

In fact in the figure attached, I want to have the 'collidesrf' and 'P' as the input for 'force objects'!!

Thanks,

Maryam