Hi thanulee,
In the Selection Tag, while Fields is enabled:
Use a Solid, if the value is 0, then nothing is selected, if the value of the solid is 100, then everything is selected.
If the Tolerance is set to 50%, then the values are: (for the Solid)
0-50% = not selected
50.1-100% = selected
You can also use a formula
id=id all are selected
id-!id nothing is selected
With a Shader Field, any image or Shader can be used
White is 100%, Black is 0%, also here the Tolerance is splitting gray-values as with the solid.
Screen capture
https://www.amazon.com/clouddrive/share/MlkDlFNDN7jI5JkPbxku9O7mxS5jWYsAt2Azm7BNGqy
Use a material with the selection to see what happen or double click the Tag to refresh the selection.
Example file
https://www.amazon.com/clouddrive/share/NzSJrUKARMsgydCCOf87knQgNM3NLL0LbhiYeXJXnzM
All the best
