Portfolio algo

Has anyone come across an algo to open up a portfolio of positions at once?

The inputs would be the pairs, long/short entry, TP, SL, order size. There would be a button to enter and reduce - not a pre-determined level; though it could be.

The algo would only enter positions when the trader tells it to. The idea is to trade a currency against a portfolio. eg USD against 6 other currencies. I would trade USD long or short and open positions on the 6 pairs to hold 6 positions in USD against each.

I can then add/remove size on a portfolio basis (all 6 pairs at once) as and when simply by clicking a button which says Add or Reduce size.

Anyone seen this before somewhere?