Once in the grid, first we prepare the grouping, in this case we will try with a static one
Then we proceed to configure the fields that are needed
Once the configuration is obtained, go to the summary configuration
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In the fields section, we will have the following view and select edit:
What the following screen will bring us and select the Multiselect box option:
Finally, we also configure the Lookup options section
Clic in button run aplication.
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