Multiple element instances in a deployment diagram

[Paul Ebert]

I would like to be able to have multiple instances of an element
(node, device, etc.) in a deployment diagram (for example, multiple
client stations connected to a server). I am using EA and it, at
least, will not let me do so. Is there a way to get around this or do
what I want to do?

I'd also like to represent two (or more) environments separated by
time. These would represent sequential aspects of a workflow (from a
deployment perspective). An example might be a sales person on the
road, giving presentations and gathering customer data at customer
sites and then connecting to the home office network at the end of the
day to load the data into an application or to access email. Again,
in this situation, I'll need multiple instances of an element (well,
they are actually the same instance at the abstract level, but are
multiple instances from the tool's perspective).

Any suggestions? Thanks.