Hi deizliel:
You should write in english in this part of the forum.
The only library I know to work with excel files is this one:
The Excel library is a new library that wraps the open source jexcel project and allows you to read or write Excel workbooks. This library supports XLS files. The new xml based format (xslx) is not supported. Setup - Download the attached library and copy both files to the libraries folder. -...
www.b4x.com
And I think (reading the link) is not possible copy the styles or add images, just the described features.
Échale un ojo a la librería del link, si no me equivoco no trabaja con imágenes y no copia formatos.
saludos,