pre-populate tabular inline in admin

Hi, i need pre-populete tabular inline in admin what is the best ways

example

class Options(models.Model):

     name = CharField(...)

class ModelA(models.Model):

    option = FK(Options)

    field_1 = IntegerField()

    field_2 = IntegerField()

    field_3 = CharField()

    field_4 = booleanField()

in forms.py

class ModelAForm(ModelForm):

    class Meta:

         model = ModelA

ModelAFormSet = formsets.formset_factory(ModelAForm, extra=Option.objects.count())

#but I do not understand when to use initial

in admin.py

extra_count = Options.objects.all().count()

class ModelAInline(admin.TabularInline)

    model = ModelA

    formset = ModelAFormSet

    extra = extra_count

    max_num = extra_count

i read this https://docs.djangoproject.com/en/1.6/topics/forms/formsets/#using-initial-data-with-a-formset

but i don't understand complete, i need my admin equal this

i have 4 Option in my class Options

option      field_1     field_2     field_3     field_4

--------------------------------------------------------------

option1      __           __            __           ___

option2      __           __            __           ___

option3      __           __            __           ___

option4      __           __            __           ___

i don't need add another !

I need all deployed only introduce additional data field_x (1,2,3,4)

as I can do this in the admin ??

any link? example? idea?

Cheers

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