2 solidworks will pick the rip edges for you by process of elimination.
Convert to sheet metal solidworks.
The sheet metal tool in solidworks is located in the sheet metal toolbar and drop down menu.
However in some circumstances when the design requires certain types of geometry you can use non sheet metal feature tools then insert bends or convert the part to sheet metal.
3 when all edges have been added to the two groups hit the green check.
Sheet metal convert and flat pattern suppressed.
Under sheet metal parameters.
When cleared the body is consumed by the convert to sheet metal feature.
In the convert to sheet metal propertymanager you specify the fixed face and thickness of the sheet metal part the default bend radius and the edges or fillet faces on which to create bends.
Here is your sheet metal box.
This approach will work for any solid body you have including imported bodies made in other systems.
Select keep body if you want to keep the solid body to use in another convert to sheet metal feature.
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Set the sheet thickness and default bend radius.
Using this tool is an all in one approach to transforming a solid body into sheet metal.
Select a face as the fixed face for the sheet metal part.
The software automatically selects the edges on which rips are applied.