Are you reusing the history container for processing the other images? If you keep the workflow simple, and leave all the masks opened, you may apply the whole container to the other images with a image container. Since they all have the same exposure time, and should be quite similar, I think that this crude approach should work. At least, you'll just need to manually tweak a little bit the curves at the end.
Carlos,
I'm able to use the process/image container once during the process of editing. Basically, I use it to flip the image, apply the first histogramTransform, and noise reduction. After this, it is all manual. Now if Juan was to get PixInsight to dynamically use Previews, I could use them throughout the process. The next steps are background neutralization, and matching the median values of the Red channel to all other images using another Preview. I'm doing this latter step all manually (i.e. tweaking the black point left or right to achieve the desired background value, for example 6389). If you know of a formula or other method that is quicker I would love to here about it.
Thanks,
Wade