NEW YORK — The WB Network will reveal this week that Tuesday will be its new fourth night of primetime programming, featuring two new dramas to distinguish its fare from the comedies and movies on other webs that night.Monday and Wednesday nights will stay mainly the same on the netlet, while Sunday nights will showcase two new comedies, one with Tom Arnold and another starring comedian Carol Leifer. The WB will announce its lineup Tuesday. Off the WB schedule this fall are “Brotherly Love,” the Joey Lawrence sitcom that was picked up this season after NBC canceled it; the Aaron Spelling soap “Savannah”; and comedy “Life with Roger.” On Monday nights, WB will keep another Aaron Spelling soap, “7th Heaven,” at 8 p.m., followed by midseason drama “Buffy the Vampire Slayer” at 9 p.m. Sources say the netlet is hoping “Buffy” will siphon off some of the young, female viewers who used to watch NBC’s Monday “women-in-jeopardy” movies, which are being yanked this fall. Tuesday nights will be led off by the new Columbia TriStar coming-of-age family drama “Dawson’s Creek” from Kevin Williamson of the feature “Scream.” At 9 p.m., the netlet will run the Paramount-MTV action-adventure hour “Three.” An interesting choice considering that rival UPN this season ran a male-driven drama Tuesdays at 9 p.m. Wednesday nights will still feature family and ethnic comedies. “Sister, Sister” will stay at 8 p.m., followed by “Smart Guy.” The netlet will also permanently flip “Jamie Foxx” from 9:30 p.m. to 9 p.m., followed by “The Wayans Bros.” ‘Freno’ set to lead off On Sundays, “Brotherly Love” is gone, and the rest of the schedule will move down a half-hour. At 7 p.m. is “Nick Freno: Licensed Teacher,” which is being revamped to attract more of a teen audience. At 7:30 p.m. will be “The Parent ‘Hood,” and at 8 p.m. “Steve Harvey.” At 8:30 p.m. is “Unhappily Ever After.” Starting at 9 p.m. Sundays, WB will air two more adult comedies. The first, from Universal, stars Tom Arnold in a family-workplace comedy hybrid. At 9:30, the netlet will air a Brillstein-Grey sitcom with former “Seinfeld” writer and standup comic Carol Leifer. For midseason, WB may pick up a Columbia comedy starring Shelley Long and Castle Rock’s sitcom “Us & Them,” which features a Southern woman who marries a Jewish man.