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To build a multiple-level dictionary within a for loop without using the defaultdict function, you can follow the below steps:

1. Create an empty dictionary.

2. Loop through the data and split it into different levels using keys.

3. Check if the first key exists in the dictionary, if not then create a new dictionary for it.

4. Check if the second key exists in the first level dictionary, if not then create a new dictionary for it.

5. Repeat the process for all the levels of the dictionary.

6. Finally, add the value to the last level.

Here is an example code:

data = [('a', 'b', 'c', 'value1'), ('d', 'e', 'f', 'value2')]

result_dict = {}

for item in data:
    level1, level2, level3, value = item[0], item[1], item[2], item[3]
    if level1 not in result_dict:
        result_dict[level1] = {}
    if level2 not in result_dict[level1]:
        result_dict[level1][level2] = {}
    if level3 not in result_dict[level1][level2]:
        result_dict[level1][level2][level3] = value

print(result_dict)

Output:

{
    'a': {
        'b': {
            'c': 'value1'
        }
    },
    'd': {
        'e': {
            'f': 'value2'
        }
    }
}