[Python] implementing checkboxes with multiple select in django admin and modelform?

I'm fairly new to Django, so I couldn't find a way to implement checkboxes with multiple select in to my custom modelforms and Django admin. I tried the Django docs, but still couldn't find a solution. TIA

views.py:

class ProjectCreate(CreateView):
model = Project
fields = ['projectid', 'title', 'description', 'startdate', 'enddate', 'cost', 'Project_type',
'employeeid', 'technologies', 'clientid', 'document']

class ProjectUpdate(UpdateView):
model = Project
fields = ['projectid', 'title', 'description', 'startdate', 'enddate', 'cost', 'Project_type',
'employeeid', 'technologies', 'clientid']


form-template.py:

{% for fields in form %}
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<span class="text-danger small">{{ fields.errors }}</span>
</div>
<label class="control-label col-sm-2">{{ fields.label_tag }}</label>
<div class="col-sm-10">{{ fields }}</div>
</div>
{% endfor %}

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