Drop Down Menu Problem

Hello Everyone im new to all of this but ive been improving works worksheet (Mouth full)
And Anyways ive been using drop down boxes (from dev tab) to select the diffrent options as shown in the picturs

Drop Down Menu:
Help.PNG
Part Of The Prices
help 2.PNG

As You Can See The 1st box you have the selection of what service to post via,
2nd is zone as some places cost more eg scotland costs £10 more then england
3rd is bag or parcel yet again price changes eg a small bag is £5 and a parcel is £8
4th delivery service eg next day, before 1pm, before 9am
5th size eg small parcel, letter, large letter,
6th class for royal mail eg 2nd class, 1st class, SD UK 1pm, 1st class SF
7th profit (10%-100%)

is there any way i can make the 2nd, 3rd, 4th, 5th, 6th and 7th all add up depending on whats selected?
Many thanks!

googled everything no look

hello thanks for the help but as this is a work spread sheet i can not upload the item but i could make a new spreadsheet quickly via coppy and past if that would be easyier for people to have a look at?
many thnaks guys

Quick Chart Coppy.xlsx
Here is a quick coppy if people can find some way around it i will be very shocked but happy :P
many thanks!