Closing a trade

[B2K]

Heres a example of what I what to do

Back Draw @ 3 then lay at @2 w/ no profit to show on the section but green on the others in the market.

So back draw £10@3 meaning Home-£10, Away -£10 and Draw +£20
then lay draw £20@2 meaning Home+10, Away +£10 and Draw 0

what do I need to do so when I back the lay bet goes in to get the result I want??

I tried the offset ticks but I what to move the profit to the other sections rather than keep it on the one I am trading on.