Good, then you can use a standard 4-pin fan Hub. These items can be confusing because some are also labelled as "Splitters" - wrongly, I contend. This is the way I use the terms. A SPLITTER is a simpler device that only connects all of its outputs in parallel to the inputs from the mobo header.This means that all of the power for the fans must come solely from the mobo header which is normally limited to 1.0 A max load. It has ONE cable arm ending in a female connector that plugs into the mobo header, and two or more male output connectors where you can plug in fans. It has no other types of connections. A HUB, on the other hand, has those two types of connectors/cables, plus one of a third type. This latter ends either in a male 4-pin Molex or in a SATA connector, and it plugs into a matching power output connector from the PSU. The HUB gets all of the power for its fans from the PSU in this way. Its cable to the mobo header does not draw any power from there, but it does pick up the PWM signal on Pin #4 and shares that out to all its fans. BOTH devices also return to the mobo header the speed signal from only ONE of its fans, because that's all a header can handle. The speeds of all the other fans on the Splitter or Hub are simply ignored. This has NO impact on speed control, but it does limit the secondary functions - fan failure detection and speed display - to only that one fan.
The confusion comes also because these devices come in several physical appearances. Most Splitters are just collections of wires ending in connectors, but there are some that look like small printed circuit boards with headers on them. Most HUBS are covered boxes with ports open on their sides (one of them marked as the only one that sends back the speed signal), but some look like just collections of arms of wires (similar to many Spltters, but WITH the third arm type) or like printed circuit boards. So physical appearance does not tell you, but the presence or absence of that third arm that must plug into a PSU output connector is the real key.
So, OP, you need a Hub with at least four 4-pin fan output connectors. Here are some examples.
https://www.newegg.com/Product/Product.aspx?Item=N82E16811999309&ignorebbr=1&cm_re=fan_hub-_-11-999-309-_-Product
That's a box style and its power source is a SATA output from the PSU.
https://www.newegg.com/Product/Product.aspx?Item=9SIACJF7730777&cm_re=fan_hub-_-1W7-005X-00042-_-Product
That's a printed circuit board style. Note it does not have a cable to go out to a SATA output from the PSU, but you must plug such a connector into the wide power input on one end of the board.
https://www.newegg.com/Product/Product.aspx?Item=9SIACJF5497319&cm_re=pwm_fan_splitter-_-9SIACJF5497319-_-Product
That's a cables-only design with 5 output connectors, but this particular one get a very negative review for product quality.
With any one of these, you plig the power connector form the Hub into a PSU power output, and the female standard fan connector into the mobo SYS_FAN header. You must ensure that the BIOS configuration of that header is set to use the normal automatic control system and ti use PWM Mode, not DC Mode or Voltage Control Mode. Then you plug all your case fans into the Hub's output ports, ensuring that one of them is into the marked port that sends back the speed signal. In this way all of those fans will receive sufficient power and that all will receive the same control signal and run at approximately the same speeds, automatically adjusted by the mobo according to heat generation by the varying workload.
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