diff --git a/tools/copy_bom/src/bom.rs b/tools/copy_bom/src/bom.rs
index 3bc1958f..d677da44 100644
--- a/tools/copy_bom/src/bom.rs
+++ b/tools/copy_bom/src/bom.rs
@@ -96,3 +96,113 @@ pub struct SourceManagement {
     files_autodep: Vec<String>,
 }
 
+impl Bom {
+    /// This func will manage the root bom file. Find all included bom files, and manage files defined in each bom file
+    pub fn manage_top_bom(
+        &self,
+        bom_file: &str,
+        root_dir: &str,
+        dry_run: bool,
+        included_dirs: &Vec<String>,
+    ) {
+        // We need to keep the order of boms and bom managements
+        let mut sorted_boms = Vec::new();
+        let mut bom_managements = Vec::new();
+        // find all included boms
+        let all_included_boms = find_all_included_bom_files(bom_file, included_dirs);
+        for included_bom in all_included_boms.iter() {
+            let bom = Bom::from_yaml_file(included_bom);
+            sorted_boms.push(bom.clone());
+            let bom_management = bom.get_bom_management(root_dir);
+            bom_managements.push(bom_management);
+        }
+        // remove redundant operations in each bom management
+        remove_redundant(&mut bom_managements);
+        // Since we have different copy options for each bom, we cannot copy all targets together.
+        let mut bom_managements_iter = bom_managements.into_iter();
+        for bom in sorted_boms.into_iter() {
+            // each bom corresponds to a bom management, so the unwrap will never fail
+            bom.manage_self(bom_managements_iter.next().unwrap(), dry_run);
+        }
+    }
+
+    /// This func will only manage the current bom file without finding included bom files
+    pub fn manage_self(self, bom_management: BomManagement, dry_run: bool) {
+        let excludes = self.excludes.unwrap_or(Vec::new());
+        bom_management.manage(dry_run, excludes);
+    }
+
+    /// This func will return all operations in one bom
+    fn get_bom_management(self, root_dir: &str) -> BomManagement {
+        let mut bom_management = BomManagement::default();
+        bom_management.dirs_to_make.push(root_dir.to_string()); // init root dir
+        if let Some(ref targets) = self.targets {
+            for target in targets {
+                let target_management = target.get_target_management(root_dir);
+                bom_management.add_target_management(target_management, root_dir);
+            }
+        }
+        bom_management
+    }
+
+    /// init a bom from a yaml string
+    fn from_yaml_string(yaml: &str) -> Result<Self, serde_yaml::Error> {
+        serde_yaml::from_str(yaml)
+    }
+
+    /// init a bom from a yaml file
+    pub fn from_yaml_file(filename: &str) -> Self {
+        let file_content = std::fs::read_to_string(filename).unwrap_or_else(|e| {
+            error!("cannot read bom file {}. {}.", filename, e);
+            std::process::exit(FILE_NOT_EXISTS_ERROR);
+        });
+        Bom::from_yaml_string(&file_content).unwrap_or_else(|e| {
+            error!("{} is not a valid bom file. {}.", filename, e);
+            std::process::exit(INVALID_BOM_FILE_ERROR);
+        })
+    }
+}
+
+impl BomManagement {
+    fn add_target_management(&mut self, mut target_management: TargetManagement, root_dir: &str) {
+        // First, we need to resolve environmental variables
+        target_management.resolve_environmental_variables();
+        let TargetManagement {
+            dirs_to_make,
+            links_to_create,
+            dirs_to_copy,
+            files_to_copy,
+            files_autodep,
+        } = target_management;
+        self.dirs_to_make.extend(dirs_to_make.into_iter());
+        self.links_to_create.extend(links_to_create.into_iter());
+        self.dirs_to_copy.extend(dirs_to_copy.into_iter());
+        self.files_to_copy.extend(files_to_copy.into_iter());
+        self.autodep(files_autodep, root_dir);
+    }
+
+    // do real jobs
+    // mkdirs, create links, copy dirs, copy files(including shared objects)
+    fn manage(&self, dry_run: bool, excludes: Vec<String>) {
+        let BomManagement {
+            dirs_to_make,
+            links_to_create,
+            dirs_to_copy,
+            files_to_copy,
+            shared_objects_to_copy,
+        } = self;
+        dirs_to_make.iter().for_each(|dir| mkdir(dir, dry_run));
+        links_to_create
+            .iter()
+            .for_each(|(src, linkname)| create_link(src, linkname, dry_run));
+        dirs_to_copy
+            .iter()
+            .for_each(|(src, dest)| copy_dir(src, dest, dry_run, &excludes));
+        files_to_copy
+            .iter()
+            .for_each(|(src, dest)| copy_file(src, dest, dry_run));
+        shared_objects_to_copy
+            .iter()
+            .for_each(|(src, dest)| copy_shared_object(src, dest, dry_run));
+    }
+}