The .gohanging tab command indents the text to the column set by the previous .ht command.
.gohanging tab
.ght
Alpha .hangingtab Designation for the first site to receive a new release of the software. Beta .gohangingtab Designation for the multiple test sites to receive a test copy of a new release.
Produces this output:
Alpha Designation for the first site to receive a new release of the software. Beta Designation for the multiple test sites to receive a test copy of a new release