How does flat rate pricing work for a plumbing company?

I want to switch to it, but it doesn't translate well into Jobber.  I need a way to organize the rates ( drains cleaning ) ( service ) (install ) and then under each have the prices for examples {Snake sink} {Snake from cleanout} {Snake with lifting the toilet}   or { Kitchen sink drain install } { Kitchen sink drain install and new Valves } { Drains + valves + Faucet install}  

I want to build out options for the client.  Easier then just templates.  

Then.... I need to be able to control the costs.  Increase all labour by 3% with out going into every single flat rate and doing it by hand.  Or, Increase all material assumptions by 5%.  

The ability to also show discount% if they are a member, and have memberships or plans built into jobber too.  (20$ a month gives you priority booking, + discount and 1 free inspection a year )  

Then to be able to show the client option 1, 2, 3 and full price vs discounted price easier.