taurusgardening:How do I go about adding a self populatuting address field box in the Add/editwork order screen so that when I enter an already existing client, the address pops up
First off the address is already stored with each work order once saved - your customization would be for display purposes on this screen only.
You'll want to build in an action on text change from the Customer drop down. As soon as someone selects the Customer you'll have a unique identifier with which to retrieve their address from the Entity table. So on text change you'll want to call a retrieve value from table to pull up their address (note: this will require you to make a retrieve for each address line). You can then use the character function to combine the address lines however you like into an Action Result which can then be displayed on screen.
Here's a screenshot showing my retrieve value action on text change for the Customer drop down.
~C