Partial close macd expert advisor

i need the trades to open at 0.000000 of the macd histogram. and close at 0.000000 of the macd histogram.

i need to partial close from 1% to 100% of the trade.

i need to partial close at a variable i set. eg. 50 points is a variable. every 50 points partial closes by 50%.

when partial closing ,then opening the next trade only use the first 2 decimal places, when multiplying the percent into the lot size.

eg. 1 lot divides to .5, at 50% partial closing rate.

.5 divides to .25

.25 divides to .125

only use .12 to open .125 lot size.

i also need added buy,sell,both trading types. eg. i can only open buy trades.