Passing Data into Forms Django

Question

Hypothetically;

I have a simple system that has a list of choices on a screen. Each item has a button so you can add multiple supplementary items/information alongside the item selected but not change the item selected. Each item has a unique id which I want to pass into the form so that the comment is always associated with the item. I have a model that contains a foreign key that links the comment to the item and the Modelform works but I have to select the item from a drop down and I would like this information to be pre-populated in the form. This seems so simple but I have been going round in circles for days. Any pointers would be greatly appreciated

This is the Model for the 'comments'

    class roundscore(models.Model):
    scoreid = models.ForeignKey('Score', on_delete=CASCADE)
    shot_1 = models.IntegerField(default=0, blank=True, null=True)
    shot_2 = models.IntegerField(default=0, blank=True, null=True)
    shot_3 = models.IntegerField(default=0, blank=True, null=True)
    shot_4 = models.IntegerField(default=0, blank=True, null=True)
    shot_5 = models.IntegerField(default=0, blank=True, null=True)
    shot_6 = models.IntegerField(default=0, blank=True, null=True)
    end_1 = models.IntegerField(default=0, blank=True, null=True)
    tens = models.IntegerField(default=0, blank=True, null=True)

This is the form

    class AddRoundScore(forms.ModelForm):
    class Meta:
        model = roundscore
        fields = [
            'shot_1',
            'shot_2',
            'shot_3',
            'shot_4',
            'shot_5',
            'shot_6',
            'end_1',
            'tens',
            'scoreid'
        ]

This is the view

    def addscorecard (request, pk):
    posts = get_object_or_404(Score, pk=pk)
    post = Score.objects.values('id', 'rndname__roundname').filter(id = pk)
    print('Post', post)
    print('Request', type(post))
    if request.method == 'POST':
        form = AddRoundScore(request.POST)
        if form.is_valid():
            post = form.save(commit=False)
            post.scoreid = post
            post.save()
            print('Errors', form.errors.as_data())
            return redirect('readscorecard', post.pk)
    else:
        form = AddRoundScore()
        print('Errors', form.errors.as_data())
        return render(request, 'score/addscorecard.html', {'form': form, 'posts': posts, 'post': post})

The scoreid field links to a table where the score is recorded. I have tried adding the pk to the function in order to pass it on to the score id rather than picking it out of a list when entering the shot values, this could lead to errors, picking the wrong scoreid. I cannot use the name associated with the scoreid as this could be the same if the same round is attempted. All I want to do is pre-populate the scoreid field with the value taken from the button on the scores page

<td><h5><a class="btn btn-outline-dark btn-block" href="{% url 'score:addscorecard' post.id %}">Add Score</a></h5></td>
<td><h5><a class="btn btn-outline-dark btn-block" href="{% url 'score:readscorecard' post.id %}">Read Score</a></h5></td>

For completeness here is the url file

     path("addscorecard/<int:pk>", views.addscorecard, name="addscorecard"),

I am sure the solution is quiet simple but I cannot get to the bottom of it

Thanks