Custom slides, i need help

[Airobit]

Hi to all,
I have a slide with two different slides, both of them set in custom, but if I change anything in the test (dimension, padding etc) inside the content (description) of one slide, all changes in the text of the other slide. How can I have the two slides really independent?. For example i would like to have one slide with the title and the description in the center of the slide, and in the other slide in a position set by working the padding and not just in the left, right center, bottom, up. Can anyone help me? Thanks