What are the different fields in Task?
Name and rate of Product.
1 : Unit Type: You can allow to add Unit Type for the particular Product. Default will be used as Hours.
You can also add default quantity
1 : Taxable: You can make product as taxable and non taxable.
2 : Default Tax: You can set default taxes for particular tasks. So when we will use same task in Invoice/ Estimates/ P.O. and Credit Note then for that task line, tax will be set according to selected task.