Nicola -
For assistance, you will have to describe "not having much luck" in more
detail.
The usual method is to choose Insert Shapes, select a shape, click and drag
on the worksheet where you want it. For me, it's usually easier to do the
squares and other nodes first before doing the connector lines. If you
attach the lines to the node objects, it's easy to fine tune the locations
later.
For an Excel add-in that automates the process, see
www.flowbreeze.com.
- Mike
http://www.MikeMiddleton.com
