have it set-up like this because if a location's name were to change then changing all the records is a simple re-lookup.
In that case, I suggest that you SHOULDN'T be using a looked up value setting. Your Work HIstory layouts can refer directly to Location Name from Location and you can discard the location name field from Work History. Then, any change to location name automatically updates the name shown on your Work History layout.
As you can imagine, having to remember each location's ID can be annoying when you're entering a ton of records in.
And why on earth do you need to remember ANY lcoation IDs? There's a location name associated with each ID's. There are a number of different ways to set things up so that you only need refer to locations by name and yet your records remain linked by ID.
The simplest approach (not necessarily the best) is to define a value list where the ID number from Location is specified for field 1 and the location name is specified for field 2. WHen the drop down list or pop up menu deploys, you can select by name, but the value list enters the ID number.
For longer sets of values, it can make sense to use a method such as is found in this Demo file:
FileMaker 12 users: https://dl.dropbox.com/u/78737945/SimpleNameLookupDemo.fmp12
Pre FileMaker 12 Users: https://dl.dropbox.com/u/78737945/SimpleNameLookupDemo.fp7