Graphics, Figures & Tables ⇒ How to customize figure/table labels?

[carol]

Hi,
I want to use figure/table labling by the system with default options in the main document and use figure/table labling with numbers predeced by S in another document related to the main document. For ex Table S1, Table S2 ..., Figure S1, Figure S2, ...
Note that I want to cross-refer to the floats in the 2nd document (labels preceded by S) from the main document

So how to preced the labels with the letter S? I guess with externaldocuments, I could access to the labels in the 2nd document from the main

thx

[carol]

I have noticed that with \externaldocument, it is possible to access the floats in another document but the numbers in the main document is continuous and in the 2nd file, it starts from 1! So the numbering is not in agreement