Slicing your 3D data is easy in Tecplot: a single click can give you what you want. But what if you want radial slices? Or theta slices? Or to clip a slice? Or to automate slice extracion? Or …
You could use Value Blanking. Or create a variable as described in this article. Or, as in this script, create a new zone and interpolate the solution onto it. Or write a Python script such as this one. Or a macro such as this one. Or, of course, ask for support!