We all know what it feels like to be served by a pro. That person treats you like a VIP while describing what’s on offer with pep and poise. Earlier this month, folks got to experience that kind of hospitality while attending a pop-up with a purpose.

On a Tuesday afternoon, Branch Line, in the Watertown Arsenal, transformed into Mulberry Wine Bar, featuring shareable snacks and American-crafted libations with a casual vibe. (Think pet-nat from Maine and rosé in a can.) High-top tables without chairs anchored the center of the space, encouraging patrons to mix and mingle. Savvy industry types were first to arrive, followed by a crowd of neighborhood regulars soon after.

The event was part of a “build your own restaurant’’ training initiative, designed to foster leadership and management skills among line staff. It’s the brainchild of general manager Deena Marlette, whose background as an educator explains why she’s passionate about hands-on learning.

“I was watching them work the floor like managers,’’ she marvels. “They had such confidence. They knew the product so well.’’ It’s no surprise. Staff members took the lead on every front, fleshing out the concept, costing out food and drink, and communicating with purveyors. After months of planning, they created an experience that felt like a win-win. Staff skills boosted? Check. Happy, well-fed guests? Double-check.

“I want to instill a culture of learning,’’ enthuses Marlette. “With Branch Line, we’re able to instill that right from the start.’’

Ellen Bhang can be reached at bytheglass@globe.com.