urgent need open cart expert

I need a function located within my opencart admin area that does the following. - A function with an adjustable time interval that updates the stock levels located in my store from the spread sheet. [login to view URL] and applies it to the relevant products. With also a button to manually do it. - A function with an adjustable time interval that removes any items located on the spread sheet that are in my store. [login to view URL] With also a button to manually do it. my budget is 42$-50$