Symphony.

Is it possible to swap out a Subsection Manager field for a Select Box Link+ field (or vice versa) whilst maintaining the linked entries?

Do these two field types use the same method of associating entries from different sections, and, if so, is there a recommended way of going about it?

Do these two field types use the same method of associating entries from different sections

Hmm, it seems the tables holding data are the same. Try to follow the same instructions as here.

Thanks @vladG - the swap out seems successful.

Here are the steps for converting a SSM field to a SBL+ one (slightly different than the ones you have for going from Upload to Unique Upload):

1. Change sym_fields.type in the row for the SSM field to selectbox_link_plus
2. In Symphony's backend, load up the section that contains the field for editing, choose the desired options for the "new" Selectbox Link Plus field and save
3. Delete the sym_entries_data_x.quantity column (where x is the id of the field), assuming you don't need it and want to tidy up
4. Delete redundant row in sym_fields_subsectionmanager (field_id)

I think the steps would be basically the same for going the other way.

Glad it worked.

In Symphony's backend, load up the section that contains the field for editing, choose the desired options for the "new" Selectbox Link Plus field and save

Hmm, good idea with configuring the field in Admin. More intuitive for the common user.