Modification of the trigger

Hi everyone!
I am willing to modify this trigger - https://marketfeeder.co.uk/learn/triggers/lay-horses-form/

This trigger should place 2 bets instead of 1. One is placed 30 seconds before the start (as it is now) and the second one should be placed in-play but the trigger should calculate the price based on the BSP. The calculation is as follows - BSP - x% (x is variable that I would like to experiment with). So for example, if x is 20% and odds on the current horse is 5.00 then trigger should place 1 bet at odds of 5.00 and the second bet at 4.00. Those 2 bets should be split for 1% of the liability. So basically 1 bet is 0.5% (This should be changeable as well so that I can place it 0.3% for the first and 0.7% for the second) of the liability and the second is 0.5% as well. Everything else should be the same as it is now.