Hi,I was working on my project based on the measuring program, it create different layers in dofferent levels, now I would like to zero all the layers, I had tryied to select all layers and in the property to fill in the geometry at the z axces zero but still it will not zero the levels with all the lines, How can I make sure that all my projects level is zeroed

Hello SamaonA, the problem with the properties of different objects is that they don't have the same Z characteristics, it will work with elements of the same familly like lines but not lines and arcs.
 
I propose to lauch the following sequence.
First verify to be in UCS World and that all your your layer are unfrozen.
 
Move all the objects from point 0,0 to 0,0,1E99 then move all the object from point 0,0,1E99 to 0,0,0.
 
Take a 3D isometric viewpoint to verify the correctness of the assembly and take a 3D viewpoint like LEFT or RIGHT to verify that all is at Z=0.

This is what the FLATTEN command is for.