diff --git a/setup.py b/setup.py
index 6bf765c..347e793 100644
--- a/setup.py
+++ b/setup.py
@@ -34,6 +34,7 @@ setup(
     entry_points={
         "console_scripts": [
             "wireviz=wireviz.wv_cli:cli",
+            "wireviz-qty=wireviz.wv_harness_quantity:qty_multipliers",
         ],
     },
     classifiers=[
diff --git a/src/wireviz/wv_harness_quantity.py b/src/wireviz/wv_harness_quantity.py
new file mode 100644
index 0000000..2e4b316
--- /dev/null
+++ b/src/wireviz/wv_harness_quantity.py
@@ -0,0 +1,85 @@
+from pathlib import Path
+
+import click
+import json
+import logging
+
+class HarnessQuantity():
+
+    def __init__(self, harnesses, multiplier_file="quantity_multipliers.txt", output_dir=None):
+        self.harness_names = [harness.stem for harness in harnesses]
+        self.multipliers = {}
+        self.folder = output_dir if output_dir is not None else harnesses[0].parent
+        self.qty_multipliers = self.folder / multiplier_file
+
+    def __getitem__(self, harness):
+        return self.multipliers[harness]
+
+    def fetch_qty_multipliers_from_file(self):
+        if self.qty_multipliers.is_file():
+            with open(self.qty_multipliers, 'r') as f:
+                try:
+                    self.multipliers = json.load(f)
+                except json.decoder.JSONDecodeError as err:
+                    raise ValueError(f'Invalid format for file {self.qty_multipliers}, error: {err}')
+        else:
+            self.get_qty_multipliers_from_user()
+            self.save_qty_multipliers_to_file()
+        self.check_all_multipliers_defined()
+
+    def check_all_multipliers_defined(self):
+        for name in self.harness_names:
+            assert name in self.multipliers
+
+
+    def get_qty_multipliers_from_user(self):
+        for name in self.harness_names:
+            try:
+                self.multipliers[name] = int(input("Quantity multiplier for {}? ".format(name)))
+            except ValueError:
+                logging.warning("Quantity multiplier must be an integer!")
+                break
+
+    def save_qty_multipliers_to_file(self):
+        with open(self.qty_multipliers,"w") as f:
+            json.dump(self.multipliers, f)
+
+    def retrieve_harness_qty_multiplier(self, bom_file):
+        return int(self[Path(Path(bom_file).stem).stem])
+
+
+@click.command(no_args_is_help=True)
+@click.argument(
+    "files",
+    type=click.Path(
+        exists=True,
+        readable=True,
+        dir_okay=False,
+        path_type=Path,
+    ),
+    nargs=-1,
+    required=True,
+)
+@click.option(
+    "-m",
+    "--multiplier-file-name",
+    default='quantity_multipliers.txt',
+    type=str,
+    help="name of file used to fetch or save the qty_multipliers",
+)
+@click.option(
+    "-f",
+    "--force-new",
+    is_flag=True,
+    type=bool,
+    help="if set, will always ask for new multipliers",
+)
+def qty_multipliers(files, multiplier_file_name, force_new):
+    harnesses = HarnessQuantity(files, multiplier_file_name)
+    if force_new:
+        harnesses.qty_multipliers.unlink(missing_ok=True)
+
+    harnesses.fetch_qty_multipliers_from_file()
+    qty_multipliers = harnesses.multipliers
+    return
+