diff --git a/.gitlab/tests/cram/README.md b/.gitlab/tests/cram/README.md
index 02bc37ae22..eb67f7a63e 100644
--- a/.gitlab/tests/cram/README.md
+++ b/.gitlab/tests/cram/README.md
@@ -120,9 +120,15 @@ dependency match the job:
 ```
 
 The command prints the ordered test paths for cram. Valid component values are
-`full`, `sanity`, `prplmesh`, `lcm`, and `prplos`. Use `sanity` to inspect the
-always-run block. The `sanity` value is for inspection, not pipeline job
-selection.
+`full`, `sanity`, `prplmesh`, `lcm`, and `prplos`. A comma-separated value such
+as `prplmesh,lcm` resolves the ordered union: the sanity block is emitted once,
+then each selected bucket in manifest order, so the job still uses one boot.
+Repeated components and tests are de-duplicated. Selecting `full`, or selecting
+all three split buckets, collapses to the legacy full-suite ordering. Do not put
+spaces around the commas.
+
+Use `sanity` to inspect the always-run block. The `sanity` value is for
+inspection, not pipeline job selection.
 
 Run the manifest lint from that environment as well:
 
diff --git a/.gitlab/tests/cram/scripts/cram_component_bucketing.py b/.gitlab/tests/cram/scripts/cram_component_bucketing.py
index 2d1d67a2e9..208c2678b0 100644
--- a/.gitlab/tests/cram/scripts/cram_component_bucketing.py
+++ b/.gitlab/tests/cram/scripts/cram_component_bucketing.py
@@ -361,6 +361,39 @@ def partition_tests(
     return buckets
 
 
+def select_component_tests(
+    full: Sequence[Path],
+    buckets: Mapping[str, List[Path]],
+    components: Sequence[str],
+) -> List[Path]:
+    """Select an ordered component union with the sanity tests first."""
+
+    allowed = {"full", "sanity", "prplmesh", "lcm", "prplos"}
+    unknown = sorted(set(components) - allowed)
+    if unknown:
+        raise BucketingError(f"unknown components: {', '.join(unknown)}")
+    if not components:
+        raise BucketingError("at least one component is required")
+
+    unique = tuple(dict.fromkeys(components))
+    if "full" in unique:
+        return list(full)
+    if len(unique) == 1:
+        component = unique[0]
+        if component == "sanity":
+            return list(buckets["sanity"])
+        return list(buckets["sanity"] + buckets[component])
+
+    selected = set(buckets["sanity"])
+    for component in unique:
+        if component != "sanity":
+            selected.update(buckets[component])
+
+    sanity = list(buckets["sanity"])
+    sanity_set = set(sanity)
+    return sanity + [path for path in full if path in selected and path not in sanity_set]
+
+
 def render_test_paths(paths: Sequence[Path]) -> str:
     """Render ordered test paths for cram's command-line arguments."""
 
diff --git a/.gitlab/tests/cram/scripts/resolve-component-tests.py b/.gitlab/tests/cram/scripts/resolve-component-tests.py
index 52ec366da2..895e2bff4b 100755
--- a/.gitlab/tests/cram/scripts/resolve-component-tests.py
+++ b/.gitlab/tests/cram/scripts/resolve-component-tests.py
@@ -16,6 +16,7 @@ from cram_component_bucketing import (
     partition_tests,
     render_test_paths,
     resolve_manifest_path,
+    select_component_tests,
 )
 
 
@@ -37,7 +38,7 @@ def parse_args(argv: Sequence[str]) -> argparse.Namespace:
     parser.add_argument(
         "--component",
         required=True,
-        choices=("full", "sanity", "prplmesh", "lcm", "prplos"),
+        help="component name or comma-separated component union",
     )
     return parser.parse_args(argv)
 
@@ -50,12 +51,10 @@ def main(argv: Sequence[str] | None = None) -> int:
         expanded = expand_manifest(args.test_root, manifest)
         full = collect_board_tests(args.test_root, args.board)
         buckets = partition_tests(full, args.test_root, expanded)
-        if args.component == "full":
-            selected = full
-        elif args.component == "sanity":
-            selected = buckets["sanity"]
-        else:
-            selected = buckets["sanity"] + buckets[args.component]
+        components = args.component.split(",")
+        if any(not component for component in components):
+            raise BucketingError("component list contains an empty value")
+        selected = select_component_tests(full, buckets, components)
     except BucketingError as error:
         print(f"error: {error}", file=sys.stderr)
         return 2