Using Josm you can select all in rectangle using the normal select tool
https://josm.openstreetmap.de/wiki/Help/Action/Select
https://josm.openstreetmap.de/wiki/Help/Action/Select
Or you can use the lasso select tool
https://josm.openstreetmap.de/wiki/Help/Action/LassoMode
Using Josm you can select all in rectangle using the normal select tool
https://josm.openstreetmap.de/wiki/Help/Action/Select
Or you can use the lasso select tool
https://josm.openstreetmap.de/wiki/Help/Action/LassoMode