While there is no command to delete half a measure, the effect can be accomplished but it will depend on what you want to achieve.
Are you wanting to shift the melody or chords and still maintain a 4/4 time afterwards?
By deleting 1/2 a measure, it means that there will be a measure of 2/4 somewhere in your song. Is this what you were after?
A little more information would help with giving some suggestions on how to accomplish what you want.
Regards,
Noel