Can we ever "APPEND" in input schedule?

Dear all:

I am not aware that we can append data, but just in case there's something I am missing, I would like to confirm:

I have multiple users who will be working on forecasting the same customers. Let's say A inputs $100, B inputs $50, C inputs $150 simultaneously. Is there anyway to collect the input as $100$50$150, whether using direct EVDRE()/EVSND() or using the "Collection" method?

So far I know the only workaround is to introduce a new dimension. But increasing number of dimensions cause larger data load, etc, which I definitely want to avoid.

Please share your wisdom! Thank you!

Brian