The global settings can only offset using the same stake or with greening
For what you want (essentially a reverse DOB) which there's a few ways you can do it
Essentially all will require at least two rules in your file
Option 1
On your the lay bet, use the stored value tab to store the lay price with an adjustment of 'X' percent
https://www.betangel.com/user-guide/stored_values.html
Then add a back bet rule and on the parameters tab have it place the bet at a Stored Value named (and enter the stored value name you created in your lay bet rule
https://www.betangel.com/user-guide/pla ... ters_.html
Option 2
Leave your Lay bet as it is
Then add a place back bet' rule, on the Parameters tab set the stake at half of what you used for your lay bet, on the conditions tab add a 'close trade profit condition' greater than and also enter whatever half your lay state is
Of the two option 2 is easier to set up but it triggers the bet when your profit target is reached so you may end up getting matched at a better price so not always have a perfect profit of half your stake every time