A method for mounting a cover with a plurality of slidable lids onto a storage compartment of a refrigerated merchandising storage unit for display and sale of foodstuff or the like, which storage compartment has a substantially rectangular top opening, wherein the method comprises the steps of: - providing two or more cover cassettes, each comprising one or more slidable lids, two cross profiles arranged along two opposite sides of the cover cassette, respectively, and two base profiles arranged along two opposite ends of the cover cassette, respectively, perpendicularly to the cross profiles, each cross profile or each base profile comprising one or more elongated and generally U-shaped tracks (14, 15), each of which is arranged for receiving an edge of a slidable lid in such a way that the slidable lid can be slid along a longitudinal direction of the track (14, 15) - mounting the two or more cover cassettes on top of the storage compartment in such a way that two opposite ends of each cover cassette rest upon two upwards-facing edges of the storage compartment, respectively, and in such a way that the two or more cover cassettes together form a cover of the refrigerated merchandising storage unit wherein the method further comprises the subsequent step of: - mounting along each of the two upwards-facing edges of the storage compartment, onto which the two or more cover cassettes rest, a cover profile, which is arranged to be able to engage releasably with the base profiles of the two or more cover cassettes. wherein the method comprises the steps of: - providing two or more cover cassettes, each comprising one or more slidable lids, two cross profiles arranged along two opposite sides of the cover cassette, respectively, and two base profiles arranged along two opposite ends of the cover cassette, respectively, perpendicularly to the cross profiles, each cross profile or each base profile comprising one or more elongated and generally U-shaped tracks (14, 15), each of which is arranged for receiving an edge of a slidable lid in such a way that the slidable lid can be slid along a longitudinal direction of the track (14, 15) - mounting the two or more cover cassettes on top of the storage compartment in such a way that two opposite ends of each cover cassette rest upon two upwards-facing edges of the storage compartment, respectively, and in such a way that the two or more cover cassettes together form a cover of the refrigerated merchandising storage unit - providing two or more cover cassettes, each comprising one or more slidable lids, two cross profiles arranged along two opposite sides of the cover cassette, respectively, and two base profiles arranged along two opposite ends of the cover cassette, respectively, perpendicularly to the cross profiles, each cross profile or each base profile comprising one or more elongated and generally U-shaped tracks (14, 15), each of which is arranged for receiving an edge of a slidable lid in such a way that the slidable lid can be slid along a longitudinal direction of the track (14, 15) - mounting the two or more cover cassettes on top of the storage compartment in such a way that two opposite ends of each cover cassette rest upon two upwards-facing edges of the storage compartment, respectively, and in such a way that the two or more cover cassettes together form a cover of the refrigerated merchandising storage unit wherein the method further comprises the subsequent step of: - mounting along each of the two upwards-facing edges of the storage compartment, onto which the two or more cover cassettes rest, a cover profile, which is arranged to be able to engage releasably with the base profiles of the two or more cover cassettes. - mounting along each of the two upwards-facing edges of the storage compartment, onto which the two or more cover cassettes rest, a cover profile, which is arranged to be able to engage releasably with the base profiles of the two or more cover cassettes.