You could only have 1 position for each market and side.
When you try to open a position by adding collateral, both positions will be combined into one position, where
- Leverage of the combined position = Average of the leverage level of each position. e.g. (1.2x + 1.4x) / 2 = 1.3x
- Size = initial collateral * leverage level.
The TP/SL you have set earlier will remain the same after the positions are combined.