try to use Buil Waveform VI after loading old data from files ...
LabView Help : "Build Waveform
Builds a waveform or modifies an existing waveform. If you do not wire an input to waveform, Build Waveform creates a new waveform based on the components you enter. If you do wire an input in waveform, the waveform is modified based on the components you specify. This function is expandable."