I'm going to be running a Plasma Cutter and 230V Tig welder. The plasma cutter requires between 55-60 amps maximum.

I was wondering what I need to do in order to run a 230 volt, 60 amp circuit from garage mounted circuit panel, to an external receptacle outside of my basement on a concrete wall.

Would a subpanel be a good option? Can I tie into the main power coming into the main circuit breaker. Then run the wiring to a subpanel located in the basement?

What do I need to do this, and how?
Would 4 gauge wiring be large enough? The run is about 60 feet altogether. Through attic above garage, down 1st story wall into basement, along basement ceiling, and outside to an external receptacle.

Any help or guidance would be greatly appreciated.

Four Gage wire should be heavy enough. If your existing box doesn't have provision for a feed to a sub panel, you will have to set a box for a breaker or fuse where you tie into the main feed. From there I would run to a weathertight exterior box outside the basement wall with a circuit breaker or fuses. You must have a disconnect within sight of the load.

How is your service entry? A 60 amp load on top of the normal load may be more than it can handle.

200 amp service.

So breaker box would have to be mounted outside in sight of the receptacle.

I know the ''in sight'' is required of anything in an industrial setting. It seems to be a standard practice now for home air conditioners. It is a poor practice to make hot connections on welders. You want a convenient disconnect.