The InstallShield Global options are required for FinalBuilder to locate the InstallShield compilers. Before using the InstallShield actions you will need to set the path to the InstallShield compilers. The options are located in Tools Menu -> Options, Install Builders category, InstallShield.
The InstallShield Global options can also be set via script (for example if you need to dynamically change the location of the compiler to support more than one version of InstallShield Developer).
Example (VBScript):
dim opt
opt = GetOptionsObject("InstallShield")
opt.DevISCmdBldLocation = "path to ISCmdBld"