Automatic Weights second time after first has been applied

Good night,

I created an armateur for a character for the first time and I used automatic weights for the deformation.

After that i added some IK bones.
In the meanwhile I added other deformation bones and new parts of the mesh, and now i wanted to re-aply the automatic weights, but without the IK’s intefering.

Any idea how I can do this?

Thanks,
Diogo

the new bones – there is a checkbox under the ‘bone’ panel that says “deform”. Uncheck it and it will not weight during automatic painting