If you have data models in ER/Studio and want to leverage them in Hackolade, you need to fist export them to XSD, following the instructions below. You should first consult this page for an overview of the import functionality in Hackolade.
By default ERwin does not export primary key and foreign key constraints.
For ER/Studio, the suggested parameters in the wizard are as follows:
Knowing that the export function does not work with all version of ER/Studio, another option is to use the MetaWizard export in XSD format: