models.py
------------
UNIT_CHOICES = (
    ('dumb_terminal', 'Dumb Terminal'),
    ('computer', 'Computer'),
)

class Unit(models.Model):
    unittype = models.CharField( choices=UNIT_CHOICES)

forms.py
------------
class GenericForm(ModelForm):
	class Meta:
		model = Inventory_Unit

class computerForm(ModelForm):
	class Meta:
		model = Inventory_Unit
		fields = ('make', 'model', 'serial', 'drive_number', 'asset_tag', 'asset_tag_2')



views.py
------------
@login_required
def inventory_freight(request, p_id):

        shipment = get_object_or_404(Shipment, id=p_id)

        message = ""

	addform = ""

	selection = "No selection"

	query = request.GET.get('unit_select', '')

	if query:
		if hasattr(forms, query+'Form'):
			formClass = getattr(forms, query+'Form')
		else:
			formClass = forms.GenericForm

		selection = "You've selected " + query
		addform = formClass()

		if request.method == 'POST':
			addform = formClass(request.POST)

			if addform.is_valid():
				instance = addform.save(commit=False)
				instance.shipment = shipment
				instance.unittype = query
				instance.save()
				# Form is valid and the new unit has been saved.
				# so we'll return a new empty unit for the user to fill in.
				form = formClass()
				message = "Unit successfully saved."
			else:
				addform = formClass()
				message = "Add "+ query +" Unit"

	else:
		#results = []
		selection = "No unit type has been selected..."


	return render_to_response('inventory_shipment.html', {'units': shipment.inventory_unit_set.all(), 'selection': selection, 'shipment': shipment, 'addform': addform, 'UNIT_CHOICES': UNIT_CHOICES,})



template
---------
{% extends "base_site.html" %}
{% block title %}Order: PCD{{ shipment.id }}<div style="float: right;"><a href="/shiptrack/ci/search/"><input type="button" value="Back to Orders"></a></div>
{% endblock %}
{% block content %}
<b>Company Name:</b> {{ shipment.company }}
<br />
<br />
<div style="float: left; width: 25%">
{{ selection }}<br />
<br />
<form method="get">
<select name='unit_select' size="15" onchange='this.form.submit()'>
<option value = "EMPTY">Choose a unit type...</option>
{% for c in UNIT_CHOICES %}
 <option value = "c[0]">c[1]</option>
{% endfor %}
</select>
</form>
</div>
<div style="float: right; width: 73%">
{% if addform %}
<form method="post">
{{ addform.as_p }}
<input type="submit" onmouseover="Tip('Click here to add a unit to this order.')" onmouseout="UnTip()" value="Add Unit" name="Add Unit" />
</form>
{% endif %}
</div>
<br />

<div style="clear: both;">&nbsp;<br /></div>

{% if units %}
	{% for s in units %}
		<tr class="{% cycle odd,even %}">
			<td><a href="">{{s.unittype}}</a></td>
			<td><a href="">{{s.make}}</a></td>
			<td><a href="">{{s.model}}</a></td>
			<td><a href="">{{s.serial}}</a></td>
			<td><a href="">{{s.asset_tag}}</a></td>
		</tr>
	{% endfor %}
{% else %}
	<p>No units.</p>
{% endif %}
{% endblock %}