I am frequently tasked with running earthquake simulations for GR63 CORE (NEBS). I have obtained the data file that generates all of the g amplitudes, however, when I input the curve into SolidWorks simulation, it truncates it to the first 5000 data points. I have no idea how to a) get it to read all the data points b) account for this in my results c) make an approximation that would allow me to use 5000 of the 6500+ points in the curve.

Any suggestions?

Which GR-63 data set are you talking about, the time-history data set or Response Spectrum Curve data set? I'm guessing you're talking about the time-history data set based high number of data points you're talking about, but I just want to confirm.

If you are using the time-history data set, then I'd like to point out that this isn't a realistic way of doing a seismic analysis, and you should instead be doing a Response Spectrum Analysis. The Response Spectrum Curves provided by NEBS have 5 or 6 data points (depending on what zone you're looking at) with a logarithmic interpolation between data points.

Let me know if you'd like more information regarding a Response Spectrum Analysis.