Odoo Create Sequence Number Generator

sequence_create.py

# First you need to define a create method for the sequence number
class ExampleClass(models.Model):
  _rec_name = 'sequence_number'
  
  @api.model
  def create(self, vals):
    if vals.get('sequence_number', 'New') == 'New':
      vals['sequence_number'] = self.env['ir.sequence'].next_by_code('mysequence.model') or 'New'
      result = super(ExampleClass, self).create(vals)
      return result
    

# after that, this .xml will hold the configuration on how the sequence are generated every
# once a form is created

<data noupdate="1">
  <record id="my_sequence_record_id" model="ir.sequence"> # rename the id
    <field name="name">My Sequence</field> # rename my sequence
    <field name="code">mysequence.model</field> # add your sequence model
    <field name="prefix">SEC.</field> # the static prefix
    <field name="padding">5</field> # the digits after prefix
    <field name="number_next">1</field> # addition on each new record created
    <field name="number_increment">1</field> # addition on each new record created
  </record>
</data>