You want a grid in the General Tab page also. After that you want to filter the records shown on the Overview Tab page based on some criteria and want to show those filtered records in the General Tab page?
OR
You want to show the field values of one selected record in the Overview Tab page in the General Tab page as it is usually shown in many AX standard forms?
If you want the 2. option then you have to follow what Lola has told.
In your form’s design in the General tab page controls use the same fields of the same datasource whose value is shown in the Grid in the Overview tab page. The field controls will show the same value in the Overview as well as General tab page.
You can go to the AOT > Forms and check the design node of any one of the many standard AX forms.