Hi Jose,
Since you've posted this question in the SDE section, I presume that you're working with versioned data. If not, please reply to that effect as the resolution to your question will be different.
So, the simplest, well... only, way to deploy a representation in a feature class across a versioned environment is to create the representation class in a version. Once the representation class has been added, it will automatically persist to all other versions. Although a representation class can be added to any version, it is a best practice to add them to the default version.
Rob
esri-redlands
