What is the best way of converting a Top Level VI into a 'sub vi' - or function ( without duplicating programming)

Hi,
General question here about design architecture, which i keep running into, but haven't found a really good solution. If i write a 'Top Level VI' to do something, what is the best way of converting it into a subVI - which is call-able from other VIs, while still allowing the top level VI to have synchronised feedback/indicator updates.
I guess the point is that when something is a top level VI you write gui logic about what happens when someone clicks buttons or whatever - which you don't want in the 'sub vi' version.
I did at one point try having a hidden boolean button that was an input to the subVI which would let the VI know if it was supposed to be doing the front panel stuff - or simply running as a subVI. This isn't really ideal though - since it would be better to be able to hive off the grizzly useful stuff from the fluffy - front panel updating stuff - having them together makes the VIs rather untidy. More annoyingly though, if you have the front panel version of it running - say waiting for you to hit 'go', it breaks all the other VIs that use it as a sub vi - since they can't compile when a sub vi is already running.
Another possibility that i tried was to basically duplicate the vi so that there was a backend part, and a front end part - and when i click 'go' the backend part is called as a sub vi. The problem with this is that it really limits the interface that the user gets - since none of the controls on the front panel update with the results untill the sub vi is over. I guess again i could solve this by passing references to some of the controls to update them in the subvi - but this doesn't really seem like the ideal situation if the subvi is called by something else without the same types of controls etc.
One final idea i had was to essentially paste all the controls in the VI into a global variable file, and make the sub vi update them, and the front panel VI read from them. This seems to 'work' - although clearly it is a work around rather than a proper solution - since i spend loads of time worrying about how i update cluster variables in the global - reading and writing.
Does anyone have any guidance on what they do to solve this problem?
JP

You could run a subvis in a Subpanel on your top level. Lets you see the current data while the subvi is running.
--Using LV8.2, 8.6, 2009, 2012--

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Flatten to string has a boolean input of "Prepend string or array size" ... The default value is true.
That only specifies if a string or array size should be prepended if the outermost data element is a string or array. For embedded strings or arrays it has no influence. This is needed for the Unflatten to be able to reconstruct the size of the embedded strings and arrays.
The choice to represent the "Strings" (and Arrays) in the external protocol to LabVIEW strings (and arrays) is actually a pretty bad one unless there is some other element in the cluster that does define the length of the string. An external protocol always needs some means to determine how long the embedded string or array would be in order to decode the subsequent elements that follow correctly.
Possible choices here are therefore:
1) some explicit length in the protocol (usually prepended to the actual string or array)
2) a terminating NULL character for strings, (not very friendly for reliable protocol parsing)
3) A fixed size array or string
For number 1) and 2) you would always need to do some special processing unless the protocol happens to use explicitedly 32 bit integer length indicators directly prepended before the variable sized that.
For number 3) the best representation in LabVIEW is actually a cluster with as many elements inside as the fixed size.

What is the best way of converting a Top Level VI into a 'sub vi' - or function ( without duplicating programming)

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