diff --git a/Controllers/LinesController.cs b/Controllers/LinesController.cs
index 7010399..5c3c3df 100644
--- a/Controllers/LinesController.cs
+++ b/Controllers/LinesController.cs
@@ -1360,45 +1360,60 @@ namespace line_gestao_api.Controllers
             for (int i = 0; i < headers.Count; i++)
             {
                 var headerRow = headers[i];
-                var map = BuildHeaderMap(headerRow);
-                int colItem = GetCol(map, "ITEM");
-                if (colItem == 0) continue;
+                var itemColumns = headerRow.CellsUsed()
+                    .Where(c => NormalizeHeader(c.GetString()) == "ITEM")
+                    .Select(c => c.Address.ColumnNumber)
+                    .OrderBy(c => c)
+                    .ToList();
+                if (itemColumns.Count == 0) continue;
 
                 var startRow = headerRow.RowNumber() + 1;
                 var endRow = i + 1 < headers.Count ? headers[i + 1].RowNumber() - 1 : lastRow;
 
-                for (int r = startRow; r <= endRow; r++)
+                for (int tableIndex = 0; tableIndex < itemColumns.Count; tableIndex++)
                 {
-                    var itemStr = GetCellString(ws, r, colItem);
-                    if (string.IsNullOrWhiteSpace(itemStr)) continue;
+                    var startCol = itemColumns[tableIndex];
+                    var endCol = tableIndex + 1 < itemColumns.Count
+                        ? itemColumns[tableIndex + 1] - 1
+                        : headerRow.LastCellUsed()?.Address.ColumnNumber ?? startCol;
 
-                    var numeroChip = NullIfEmptyDigits(GetCellByHeaderAny(ws, r, map,
-                        "Nº DO CHIP", "N° DO CHIP", "NUMERO DO CHIP", "N DO CHIP", "NUM. DO CHIP", "N° DO CHIP"));
-                    var observacoes = GetCellByHeaderAny(ws, r, map, "OBSERVAÇÕES", "OBSERVACOES", "OBS");
-                    if (string.IsNullOrWhiteSpace(numeroChip) && string.IsNullOrWhiteSpace(observacoes))
+                    var map = BuildHeaderMapRange(headerRow, startCol, endCol);
+                    int colItem = GetCol(map, "ITEM");
+                    if (colItem == 0) continue;
+
+                    for (int r = startRow; r <= endRow; r++)
                     {
-                        continue;
-                    }
+                        var itemStr = GetCellString(ws, r, colItem);
+                        if (string.IsNullOrWhiteSpace(itemStr)) continue;
 
-                    var now = DateTime.UtcNow;
+                        var numeroChip = NullIfEmptyDigits(GetCellByHeaderAny(ws, r, map,
+                            "Nº DO CHIP", "N° DO CHIP", "NUMERO DO CHIP", "N DO CHIP", "NUM. DO CHIP"));
+                        var observacoes = GetCellByHeaderAny(ws, r, map, "OBSERVAÇÕES", "OBSERVACOES", "OBS");
+                        if (string.IsNullOrWhiteSpace(numeroChip) && string.IsNullOrWhiteSpace(observacoes))
+                        {
+                            continue;
+                        }
 
-                    var e = new ChipVirgemLine
-                    {
-                        Id = Guid.NewGuid(),
-                        Item = TryInt(itemStr),
-                        NumeroDoChip = numeroChip,
-                        Observacoes = string.IsNullOrWhiteSpace(observacoes) ? null : observacoes.Trim(),
-                        CreatedAt = now,
-                        UpdatedAt = now
-                    };
+                        var now = DateTime.UtcNow;
 
-                    buffer.Add(e);
+                        var e = new ChipVirgemLine
+                        {
+                            Id = Guid.NewGuid(),
+                            Item = TryInt(itemStr),
+                            NumeroDoChip = numeroChip,
+                            Observacoes = string.IsNullOrWhiteSpace(observacoes) ? null : observacoes.Trim(),
+                            CreatedAt = now,
+                            UpdatedAt = now
+                        };
 
-                    if (buffer.Count >= 500)
-                    {
-                        await _db.ChipVirgemLines.AddRangeAsync(buffer);
-                        await _db.SaveChangesAsync();
-                        buffer.Clear();
+                        buffer.Add(e);
+
+                        if (buffer.Count >= 500)
+                        {
+                            await _db.ChipVirgemLines.AddRangeAsync(buffer);
+                            await _db.SaveChangesAsync();
+                            buffer.Clear();
+                        }
                     }
                 }
             }
@@ -1632,6 +1647,21 @@ namespace line_gestao_api.Controllers
             return map;
         }
 
+        private static Dictionary<string, int> BuildHeaderMapRange(IXLRow headerRow, int startCol, int endCol)
+        {
+            var map = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);
+            foreach (var cell in headerRow.CellsUsed())
+            {
+                var col = cell.Address.ColumnNumber;
+                if (col < startCol || col > endCol) continue;
+
+                var k = NormalizeHeader(cell.GetString());
+                if (!string.IsNullOrWhiteSpace(k) && !map.ContainsKey(k))
+                    map[k] = col;
+            }
+            return map;
+        }
+
         private static DateTime? ToUtc(DateTime? dt)
         {
             if (dt == null) return null;