This is how to use F3x (Btools) advanced

Part 1: The basics

The move tool: Z

Resize tool X

Rotate tool C

Weld tool F

Texture tool G

Mesh tool H

New part tool J

Part 2: More advanced

How to weld items together

Select one part then ctrl-click the next one then press weld to last.

How to select items in a group

Press Shift+T to select items in a group.

This also works for the coloring and texture tool.