Your question could have been more precise but I assume your want to know how to retrieve data. For a datagrid you can use as source:
- Database , for example Customers, filtering is done via XPath example [Number>100]
- Microflow: add a retrieve action, set the result of the microflow to a list of object and return the result variable of the retrieve action.
- Association (see doc)
There is concise documentation on this subject