Problem: When using actions like add child add change too many results are being displayed.
Solution: The query used is defined in the user interface properties of the required object in Object Designer.
On the drop down for the default query (on the right had side when loading the object) you can select a query to use or create one and use this. By default the all changes/all incident ... query is used. This can be change as required in Query Designer
If the query has criteria this will be applied to results. It maybe better to use a prompted query to select the values the user wishes to display.