Hide duplicate fields on a continuous form

Hi I wonder if someone can help me please with a problem that's been baffling
me for days.

Basically I have two tables, one that shows different departments, the other
shows invoices allocated to that particular department. They are linked via
an InvoiceID using a One to Many relationship.

What I would like to do is to create a continuous form which shows all the
invoices allocated to the Departments, but without showing a duplication of
the department name.

e.g.

DEPARTMENT INVOICENO.

Wages 1
2
3

Personnel 1
2


I know that this can be done relatively easy on a report by hiding duplicate
values, but can anyone offer any guidance please on how this can be done on
form?

Many thanks

Chris

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