# How to get a different sequence based on field
**URL:** https://discuss.tryton.org/t/how-to-get-a-different-sequence-based-on-field/4935
**Category:** Developer
**Created:** [January 20, 2022, 3:49pm UTC](https://discuss.tryton.org/t/how-to-get-a-different-sequence-based-on-field/4935 "2022-01-20T15:49:23Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@acaubet](https://discuss.tryton.org/u/acaubet)
#### Post date: [January 20, 2022, 3:49pm UTC](https://discuss.tryton.org/t/how-to-get-a-different-sequence-based-on-field/4935/1 "2022-01-20T15:49:23Z")
I have the custom field:
```auto
class Sale(metaclass=PoolMeta):
custom_field = fields.Many2One('custom.model', "CUSTOM FIELD")
def get_production(self):
production = super().get_production()
production.custom_field = self.custom_field
return production
```
On creating the shipment I want the shipment to use a sequence based on that field, somethink like this:
```auto
class Production(metaclass=PoolMeta):
__name__ = 'production'
custom_field = fields.Many2One('custom.model', "CUSTOM FIELD")
@classmethod
def create(cls, vlist):
pool = Pool()
Config = pool.get('production.configuration')
vlist = [x.copy() for x in vlist]
config = Config(1)
default_company = cls.default_company()
for values in vlist:
if values.get('number') is None:
values['number'] = config.get_multivalue(
'production_sequence',
custom_field=values.get('custom_field'),
company=values.get('company', default_company)).get()
productions = super().create(vlist)
return productions
```
But I don’t know how to extend sequence or config to allow this.
Also If there are other simple/clean solutions feel free to suggest.
---
### Author:  [@pokoli](https://discuss.tryton.org/u/pokoli)
#### Post date: [January 20, 2022, 4:35pm UTC](https://discuss.tryton.org/t/how-to-get-a-different-sequence-based-on-field/4935/2 "2022-01-20T16:35:05Z")
> [@acaubet](#):
>
> But I don’t know how to extend sequence or config to allow this.
You should add your custom field to the sequence multivalue model and define a diferent sequence record for each custom\_field value. Then the `get_multivalue` will pick the right values with your current code.
---
### Author:  [@system](https://discuss.tryton.org/u/system)
#### Post date: [February 19, 2022, 4:35pm UTC](https://discuss.tryton.org/t/how-to-get-a-different-sequence-based-on-field/4935/3 "2022-02-19T16:35:30Z")
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