delet the properties from SDF file

Hello team,

i want to delet some properties from a sdf file and generate a new sdf file without this properties.

I already use sdf Reader node and extract the properties which i dont want. but as i generate a new sdf file , these propterties are still inside. however after i extract the files from sdf reader and open the file, these properties are not shown in the table. olnly in new generated file.

can anyone help me?