Put your algo names in a string array:

string Algos[10];
int N=0;
while(algo(loop("name1","Name2",...))) {
Algos[N++] = Algo;
...
}

Then you can later go through all your algos with a simple for loop:

for(i=0; i<N; i++) {
algo(Algos[i]);
...
}

You can not edit the lot number of an open trade. When you buy an asset, you must already know how many lots you want to buy.