Thank you for the info. I looked at the link. it looks like I can only retrieve value if the field is part of an entity.
I am using a placeholder field on the portal but that field is not available in any of the entities in the database.
For example, i set values, which are selected from multi-select dropdown, to "Field A" in Portal page.
When a user submits the form, I need to get the Field A values in a plugin. Then use split function to extract each value to save them to entity fields.
Any suggestion on how to get the "Field A" value in a plugin?
thank you,
Siva