在Corel Draw中避免曲线重叠的解决方法如下：

1. 使用切割工具进行曲线分割：

Sub SplitCurves()
    Dim s As Shape
    Dim c As Curve
    Dim sr As ShapeRange
    Dim i As Integer
    
    Set sr = ActiveSelection.Shapes.All
    
    For Each s In sr
        If s.Type = cdrCurveShape Then
            Set c = s.Curve
            If c.Closed Then
                c.SplitAtNode (c.Nodes.Count)
            Else
                c.SplitAtNode (c.Nodes.Count - 1)
            End If
        End If
    Next s
End Sub

2. 使用边界操作工具进行曲线分离：

Sub SeparateCurves()
    Dim s As Shape
    Dim sr As ShapeRange
    
    Set sr = ActiveSelection.Shapes.All
    
    For Each s In sr
        If s.Type = cdrCurveShape Then
            s.BreakApart
        End If
    Next s
End Sub

3. 使用Union合并工具进行曲线合并：

Sub MergeCurves()
    Dim s As Shape
    Dim sr As ShapeRange
    
    Set sr = ActiveSelection.Shapes.All
    
    For Each s In sr
        If s.Type = cdrCurveShape Then
            s.Combine
        End If
    Next s
End Sub

以上代码示例可以通过VBA宏在Corel Draw中执行。请注意，在使用这些代码之前，确保已选中要处理的曲线。