price list

Hi, I need a little advice on the approach I should take for price list that I would like in my employee content types.

I would like a price list which can have a
Price per hour
Price per day
Price per week
Price per ect ect

onsite offsite
1 hr £15 £20

2 hrs £25 £30

3 hrs £30 £35

Basically I want to give the employee the flexibility to layout a table of payment as they see fit. I would like employees to be able to add as few or as many rows as they would like.

I would like users to be able to search for employees between certain price brackets so I want to make it compatible with that.

I basically need an undefined number of rows which I cannot see how to define in CCK, I would like this form to have as many field as the user would like. Can you suggest a solution to my problem.

Once again thankyou for all the help