Does Tektronix have PC based Software which will allow me to generate+ manage+ and load waveforms into an ARB?

Yes, ArbExpress will allow you to perform these functions. It allows you to generate basic and advanced waveforms. You may also define equations to describe the waveform. These may then be downloaded into the Arb through its communication link.

Here is the link for additional information and download of the software: ArbExpress