How to filter displaying data in a grid according to a parameter passed from another form

You need to override the init method of the data source of your form following this way for example:

public void init()
{
    SysDimension        SysDimension;
    ;

    super();

    if( element.args().parm())
    {
        SysQuery::findOrCreateRange(this.query().dataSourceTable(tablenum(Dimensions)), fieldnum(Dimensions, DimensionCode)).value(queryValue(element.args().parm()));
    }
    else
    {
        SysQuery::findOrCreateRange(this.query().dataSourceTable(tablenum(Dimensions)), fieldnum(Dimensions, DimensionCode)).value(queryValue(SysDimension::Department));
    }
}