How to Setup a Drawing Scale that also PRINTS to scale.

In UML static structure i am not able to find any symbol which will explain unary association(uni directional).Please provide any solution.

I have created a Space Plan by taking the input date from an EXCEL Sheet by importing it to VISIO.But then by changing some value in EXCEL the VISIO is automatically takes care of the changes by clicking "Refresh Data" button under Plan tab.
Now if I need to put the VISIO file and the EXCEL to some other location then I could see the links between VISIO and EXCEL are breaking.Then if I click the "Refresh Data" button the VISIO is then importing all the data from EXCEL to the Unplaced data tab and there is no relation with the already drawn diagram.
It would be of great help if you could tell me how to recreate the link between VISIO and EXCEL.

I am using Visio to store asset information for media content. I have
developed my own masters. I have entered all my custom properties'
information. I generated a report of the custom properties' information,
added information in the Excel report, and then reimported the data. All was
well. The data I updated quickly in Excel now shows in Visio!

However, if I close the Visio file, once I reopen it, most of my custom
properties are gone or changed.

I'm using the add-on "Number Shapes" to generate a reference id for each
shape-represented-asset. One time, it renumbered them all to 11. In this last
attempt, it simply erased all of the custom properties but two.

Help!