Splitting a project into two projects then referencing project variables

My single project script executes up to 50 large DDTs sequentially so that the log file can become massive. Since my question here failed to come up with a method of breaking up the log file I am trying to split my project in two with a master project calling the salve project for each DDT. Hopefully I will get a separate log file for each slave project execution.

My slave project has many calls to project.variables that have been created in the slave project.

When the master project calls methods in the slave project each call (in the slave script) to a project.variable results in "Object does not support this property or method".

My assumption is that the 'project' being referenced here is the master project, rather than the slave project where the command resides.

Other than moving all of my slave project variables to become projectsuite variables how can I make my code execute as before?

The following may be easier to understand what I am trying to do:

MASTER PROJECT : Unit1

'USEUNIT slaveUnit

sub main

  call slaveRoutine

end sub

SLAVE PROJECT : SlaveUnit

sub slaveRoutine

   log.message("Project = " & project.filename)

   project.variable.myvariable = 5 '***

end sub

When slaveRoutine is executed directly it logs Project = Slave project and sets the slave project variable myvariable to 5.

When slaveRoutine is called from main it logs Project = Master project and returns "Object doesn't support this property or method".