diff --git a/README.md b/README.md
index 8902756..d879719 100644
--- a/README.md
+++ b/README.md
@@ -114,6 +114,29 @@ Specify the list's force direction. Options include: auto (default), top, and bo
 ->direction('top')
 ```
 
+Customize how the tree is built with a custom callback function
+
+```php
+->getTreeUsing(function () {
+    // Build and return your custom tree structure as a Collection
+    return collect([
+        [
+            'name' => 'Custom Category 1',
+            'value' => 1,
+            'parent' => null,
+            'children' => [
+                [
+                    'name' => 'Subcategory 1.1',
+                    'value' => 2,
+                    'parent' => 1,
+                    'children' => []
+                ]
+            ]
+        ]
+    ]);
+})
+```
+
 Display individual leaf nodes instead of the main group when all leaf nodes are selected
 
 ```php
diff --git a/src/SelectTree.php b/src/SelectTree.php
index e809057..c4ce70a 100644
--- a/src/SelectTree.php
+++ b/src/SelectTree.php
@@ -88,6 +88,8 @@ class SelectTree extends Field implements HasAffixActions
 
     protected Closure|array|null $prepend = null;
 
+    protected ?Closure $getTreeUsing = null;
+
     protected function setUp(): void
     {
         // Load the state from relationships using a callback function.
@@ -149,6 +151,10 @@ protected function setUp(): void
 
     protected function buildTree(): Collection
     {
+        if ($this->getTreeUsing) {
+            return $this->evaluate($this->getTreeUsing);
+        }
+
         // Start with two separate query builders
         $nullParentQuery = $this->getRelationship()->getRelated()->query()->where($this->getParentAttribute(), $this->getParentNullValue());
         $nonNullParentQuery = $this->getRelationship()->getRelated()->query()->whereNot($this->getParentAttribute(), $this->getParentNullValue());
@@ -418,7 +424,7 @@ public function getTree(): Collection|array
 
     public function getResults(): Collection|array|null
     {
-        return $this->evaluate($this->results);
+        return $this->results;
     }
 
     public function getExpandSelected(): bool
@@ -614,4 +620,11 @@ public function createOptionModalHeading(string|Closure|null $heading): static
 
         return $this;
     }
+
+    public function getTreeUsing(?Closure $callback): static
+    {
+        $this->getTreeUsing = $callback;
+
+        return $this;
+    }
 }