May one move, or remove, the decorations from the Sukkah if he does not plan on making a use with them?[1]
During Chol Hamoed it is permitted to move and even remove the decorations from the Sukkah if one does not plan to use them, and they are not considered Muktzah.[2] Thus, it is permitted to remove them due to the rain or worry of thieves. Likewise, one may remove the decorations to replace them elsewhere in the Sukkah, or in another Sukkah.[3] However, on Shabbos and Yom Tov they may not be moved due to Muktzah, unless one stipulated on them before Yom Tov as stated above or is lenient to follow the custom.
[1] See Piskeiy Teshuvos 638:6-7
[2] Implication of Admur 638:6 regarding them being Muktzah on Shabbos and Yom Tov that they may be moved during Chol Hamoed and so is implied behind his reasoning for them being prohibited in benefit due to it being belittling of them, and not due to that one is removing them from their Kedusha; Rav SZ”A in Sukkah Hashaleim 10; Piskeiy Teshuvos 638:6 according to those Poskim who rule that one may take down a Sukkah on Sukkos and 638:7 that when removing to prevent damage everyone agrees.
Other opinions: Some Poskim understand that it is forbidden to take down Sukkah decorations even if one does not plan on using them, being that one demotes them from their holiness. [See Piskeiy Teshuvos 638:3 and 6]
The reason: As they are only prohibited in benefit and not in being removed, and thus so long as one does not plan to benefit from the after their removal it is permitted to remove them. [Piskeiy Teshuvos ibid]
[3] Tzitz Eliezer 13:67