Inherit only a Subset of Fields of Pydantic Model

I would like to generate a Pydantic model that inherits from a parent class, but only has a subset of that parent model's fields.

E.g. ModelB should inherit only field_b from ModelA:

from pydantic import BaseModel

class ModelA(BaseModel):
    field_a: str
    field_b: str

class ModelB(ModelA):
    pass

It was enough for me to hard copy the field and to adjust the extras I had defined. Here is a snippet from my code:

import copy

from pydantic import BaseModel


def copy_primary_field(
        model_from: BaseModel,
        model_to: BaseModel,
        primary_key: str,
) -> BaseModel:
    new_field_name = f"{model_from.__name__}" + "_" + primary_key
    model_to.__fields__[new_field_name] = copy.deepcopy(
        model_from.__fields__[primary_key]
    )
    model_to.__fields__[new_field_name].name = new_field_name
    model_to.__fields__[new_field_name].field_info.extra["references"] = (
            f"{model_from.__name__}" + ":" + primary_key
    )

    return model_to