Backup your database

Always first! This is a destructive operation if done wrong.

Identify products to convert

Only proceed if the template has more than one variant.
templates_to_convert = env['product.template'].search([('product_variant_count', '>', 1)])

Iterate over each variant

Write a script to process each product.product variant and create a standalone product.template.
Example Logic (Python or Server Action):

for product in templates_to_convert.mapped('product_variant_ids'):

    old_template = product.product_tmpl_id

    # Copy fields from the template

    new_template_vals = {

        'name': f"{old_template.name} - {product.display_name}",  # or custom naming

        'type': old_template.type,

        'categ_id': old_template.uom_po_id.id,

        'taxes_id': [(6, 0, old_template.taxes_id.ids)],

        'supplier_taxes_id': [(6, 0, old_template.supplier_taxes_id.ids)],

        'description': product.description or old_template.description,

        'default_code': product.default_code,

        'barcode': product.barcode,

        'image_1920': product.image_1920,

        # add other fields you want to preserve

    }

    # Create new template

    new_template = env['product.template'].create(new_template_vals)

    # You can also update the product.product record if needed

    new_product = new_template.product_variant_id

    # Optional: Copy stock quantities, routes, BOMs, etc.

    # Optional: deactivate old product or mark it for review

Copy extra info if needed

• Stock Quantities: Transfer from old variant to new product.
• BOMs: Reassign to the new product.template.
• Sales/Purchase history: Keep using the old product if traceability is important.
• Custom Fields: If you've added custom fields, map them accordingly.