Infinite Numbers Of Data

I have a problem with creating a spreadsheet.

I need a dialogue box, which asks the user the following:

* 1) Number of Plants
* 2) Number of Feeds
* 3) Total Daily Hazard (4*1)
* 4) Amount of Potentially Hazardous Food Daily
* 5) Excretion Rate Daily (% of Remaining)

I then need a table to show:

Along the top - The Number of Feeds (2)
Down the Side - The Number of Plants (1)

This is to show the amount of Potentially Hazardous material in each plant per day – and also the amount of Potentially hazardous material in ALL the plants per day on the bottom line.

Simple? – Well, my problem is that I need to create a loop which will work with the data potentially being infinite – The Number of Plants (1), The Number of Feeds (2), could be anything from 1 to Infinity.