diff --git a/tp-tests.el b/tp-tests.el
index 829fdcf..40a0a92 100644
--- a/tp-tests.el
+++ b/tp-tests.el
@@ -763,45 +763,6 @@ Returns list of (START END VALUE) intervals."
     (should (equal (tp-get 0 5 'face str) '((0 5 bold))))
     (should (null (tp-get 6 11 'face str)))))
 
-;;; ============================================================
-;;; Fine-grained Property Manipulation Tests
-;;; ============================================================
-
-(ert-deftest tp-test-get-sub-property ()
-  "Test tp--get-sub retrieves sub-property from face."
-  (tp-test-with-temp-buffer
-    (insert "Hello")
-    (put-text-property 1 6 'face '(:foreground "red" :weight bold))
-    (should (equal (tp--get-sub 1 'face :foreground) "red"))
-    (should (eq (tp--get-sub 1 'face :weight) 'bold))
-    (should (null (tp--get-sub 1 'face :background)))))
-
-(ert-deftest tp-test-put-sub-property ()
-  "Test tp--put-sub sets sub-property on face."
-  (tp-test-with-temp-buffer
-    (insert "Hello")
-    (tp--put-sub 1 6 'face :foreground "blue")
-    (should (equal (tp--get-sub 1 'face :foreground) "blue"))
-    ;; Add another sub-property
-    (tp--put-sub 1 6 'face :weight 'bold)
-    (should (eq (tp--get-sub 1 'face :weight) 'bold))
-    (should (equal (tp--get-sub 1 'face :foreground) "blue"))))
-
-(ert-deftest tp-test-remove-sub-property ()
-  "Test tp--remove-sub removes sub-property from face."
-  (tp-test-with-temp-buffer
-    (insert "Hello")
-    (put-text-property 1 6 'face '(:foreground "red" :weight bold))
-    (tp--remove-sub 1 6 'face :foreground)
-    (should (null (tp--get-sub 1 'face :foreground)))
-    (should (eq (tp--get-sub 1 'face :weight) 'bold))))
-
-(ert-deftest tp-test-sub-property-on-string ()
-  "Test fine-grained property manipulation on strings."
-  (let ((str (copy-sequence "Hello")))
-    (tp--put-sub 0 5 'face :foreground "green" str)
-    (should (equal (tp--get-sub 0 'face :foreground str) "green"))))
-
 ;;; ============================================================
 ;;; New API Tests (tp-reset, tp-set, tp-set-face, tp-set-display, tp-add)
 ;;; ============================================================
diff --git a/tp.el b/tp.el
index b2be22e..d2e9142 100644
--- a/tp.el
+++ b/tp.el
@@ -675,57 +675,6 @@ OBJECT defaults to current buffer."
 
 ;;; Private functions for fine-grained property manipulation
 
-(defun tp--get-sub (position property sub-property &optional object)
-  "Get SUB-PROPERTY from PROPERTY at POSITION in OBJECT.
-For example, get :foreground from a face property.
-OBJECT defaults to current buffer.
-This is a private function - use `tp-get' with nested path for public API."
-  (let ((prop-value (get-text-property position property object)))
-    (cond
-     ;; Property is a plist (e.g., (:foreground \"red\" :weight bold))
-     ((and (listp prop-value) (keywordp (car prop-value)))
-      (plist-get prop-value sub-property))
-     ;; Property is an alist
-     ((and (listp prop-value) (consp (car prop-value)))
-      (cdr (assoc sub-property prop-value)))
-     ;; Property is a list of face specs
-     ((listp prop-value)
-      (cl-loop for spec in prop-value
-               when (and (listp spec) (keywordp (car spec)))
-               thereis (plist-get spec sub-property)))
-     (t nil))))
-
-(defun tp--put-sub (start end property sub-property value &optional object)
-  "Set SUB-PROPERTY of PROPERTY to VALUE from START to END in OBJECT.
-Merges the sub-property into the existing property value.
-For example, set :foreground of a face property.
-OBJECT defaults to current buffer.
-Internal function - use `tp-add' with nested plist for public API."
-  (let* ((pos start))
-    (while (< pos end)
-      (let* ((current-value (get-text-property pos property object))
-             (next-pos (or (next-single-property-change pos property object end) end))
-             (new-value
-              (cond
-               ;; No existing value - create new plist
-               ((null current-value)
-                (list sub-property value))
-               ;; Existing plist
-               ((and (listp current-value) (keywordp (car current-value)))
-                (plist-put (copy-sequence current-value) sub-property value))
-               ;; Existing symbol (e.g., 'bold) - convert to list and add
-               ((symbolp current-value)
-                (list current-value sub-property value))
-               ;; Other list - wrap and add
-               ((listp current-value)
-                (append current-value (list sub-property value)))
-               (t (list sub-property value)))))
-        (put-text-property pos next-pos property new-value object)
-        (setq pos next-pos))))
-  (if (stringp object)
-      object
-    (cons start end)))
-
 (defun tp--remove-sub (start end property sub-property &optional object)
   "Remove SUB-PROPERTY from PROPERTY between START and END in OBJECT.
 For example, remove :foreground from a face property.