How to create SubVI with unlimited input

[Kousha]

Hi
I was wondering how can I create a subvi, where then I can add as many inputs as required?
For instance, let's say i want to create a subvi that calculates the mean of all the inputs connected to it.
Now, I could at one instance have 3 integers going in, at others, 5.
I know I can use an array to input numbers, but I want to be able to add scalars. (like for instance with Index Array, you can extend and enter as many indeces as you want)
Thanks
Kousha

[mfitzsimons]

Inputs need to be predefined.  For different data types you can use polymorphic.  You can define them and set them to a default value (like -1) and only use the inputs that are not equal to the default value.