Follow the instructions below to use a user-defined variable within a task attribute (property):
When defining a task in a Project, click the
icon next to the field to insert a variable (if applicable).
A list of variables is displayed.
Click the variable to use in the attribute.
When using a variable within a Project task attribute, it should be formatted as ${variablename}.
Listed below is an example of how the user-defined variable of "File_Suffix" is used to suffix (append) its value to a file name.
More than one variable can be combined into a task's attribute. For instance you could have a variable containing a directory name (named "dir"), another variable containing a file name (named "file") and yet another variable containing a file extension (named "ext"). You could use all three variables for building a file path by using the syntax of ${dir}/${file}.${ext}