Hi Luis,
still unsure why you want to split it. but you can copy the schema definition out of the wsdl and store is externally.
and import the xsd to your wsdl
<xsd:import namespace="http://beans.webservicesglp.scopglp.osinerg.com" schemaLocation="EXTERNAL_DIRECTORY/DetalleOrden.xsd"/>
<xsd:import namespace="http://beans.webservicesglp.scopglp.osinerg.com" schemaLocation="EXTERNAL_DIRECTORY/OrdenPedido.xsd"/>
the schemaLocation is the location where you have stored the xsd's externally.
Note, you need to modify messages and operations in the wsdl based on the namespace of your external xsd's
once you import the modified .wsdl you will be able to see the imported xsd's and service definition. and you will be able to see the xsd's in external references of the service as your screenshot.
above all, I believe you only have to modify soap encoded definitions to make your current wsdl work.
wait for other experts to comment, may be there some other solution.