Next week, Manchester’s casino could take a big step toward becoming a much bigger version of itself.

Fuss and O’Neill, on behalf of applicant New Hampshire Group LLC and owner Anagnost Investments Inc. will go before the Manchester Zoning Board of Adjustment (ZBA) to help Revo Casino and Social House at 1279 South Willow Street incorporate two adjacent lots on John E. Devine Drive into a new larger combined lot…