You can not do it in Subgrid but you can do it at record level. For eg. We have two entities Entity A and Entity B. Entity A form has Subgrid of entity B, Follow below step: 1.Open a Entity A record --> Double click on Entity B subgrid row. It will open an Entity B record. 2. You will get lookup of Entity A on Entity B form, Make this lookup blank and save record. If you are not able to see Entity A lookup on Entity B form then go to customization and add it on form.
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