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+#' Select Required Variables
+#'
+#' Subsets a given data frame so it contains only those variables stated in a
+#' given variable level metadata.
+#'
+#' @param .df A data frame of CDISC standard.
+#' @param metacore A data frame containing variable level metadata.
+#' @param domain A character value to subset the `metacore`. If `NULL` (default),
+#'   uses `.df` value as a subset condition.
+#' @param verbose The action the function takes when a variable in the `metacore`
+#'   is not found in the `.df`. Options are 'stop', 'warn', 'message', and 'none'.
+#'
+#' @return Data frame containing only those variables given in the metadata.
+#' @family metadata functions
+#' @seealso [xportr_df_label()], [xportr_format()], [xportr_label()], and
+#'   [xportr_length()]
+#' @export