HELP : Deleting props with Codewalker

[NavisCraft]

Hello,

I need your help for deleting prop in the two planes hangars on Zancudo air base.
In Codewalker, i'm able to remove props from the map but when I save the YMAPs and replaced it in OpenIV, the game load the vanilla map with all props.

Can someone help me to learn how deleting props properly ?

Thank you in advance for the help.