Have a 3010 SD and only line 1 rings, there are 4 lines.

Sounds like the system defaulted programming.
Depending on the type of prostar 616 the only ringing station would be 1(or 21) with the porstar or 4(or 24) with the prostar plus.
To change the ringing on a prostar 816 you first need to be at a display set (doesn't matter what the extension number is).
with the handset down, enter #20 the screen should say MMC DISABLED
enter in 1 2 3 4 1 # (that enables programming)
enter in #62 the screen should say day ring assn
press the line you wish to program
press the buttons for the extensions that you wish to ring (the ones in the right next to the handset)
press # when finished with the line
repeat steps 2 through 5 for the remainder of the lines you wish to change
press # when finished.
To program system speed dial numbersyou need the customer programming enabled (see the first part of programing ringing)
press the ALM/SD button
dial the 2 digit speed dialcode 10-98
dial the telephone number to be stored in that speed dial bank
press ALM/SD to store the number

You will have to do a little programming to accomplish this. I attached a website to this message that has all the Toshiba manuals. You will have to look at program number 16 for line access and 81 for ringing options. The code to get in program mode is *#*#1*2*3. Hope this helps.

To change the ringing on a prostar 816 you first need to be at a display set (doesn't matter what the extension number is).
with the handset down enter #20 the screen should say MMC DISABLED
1) enter in 1 2 3 4 1 # (that enables programming)
2) enter in #62 the screen should say day ring assn
3) press the line you wish to program
4) press the buttons for the extensions that you wish to ring (the ones in the right next to the handset)
5) press # when finished with the line
6) repeat steps 2 through 5 for the remainder of the lines you wish to change
press #when finished.

If the phone is on any Toshiba DK system, enter programming mode my pressing the following sequence (without selecting an intercom line, or an outside line, but at the phone's idle state with the handset down) *#*#1*2*3
On a CIX or CTX System, again, at the phone's idle state w/ handset down dial *#*#1*2*3*

Sounds like the ring assignmet programming has defaulted.( all lines ring at station 4 only)
To change the ringing on a prostar 816 you first need to be at a display set (doesn't matter what the extension number is).
with the handset down enter #20 the screen should say MMC DISABLED
1) enter in 1 2 3 4 1 # (that enables programming)
2) enter in #62 the screen should say day ring assn
3) press the line you wish to program
4) press the buttons for the extensions that you wish to ring (the ones in the right next to the handset)
5) press # when finished with the line
repeat for each line

1) To stop the ringing in your ear, press Redial and Vol Down at the same time



The following must be performed from station 10 or 200.

2) To change date : Press INTCM, #, 6, 5, 1, Enter date YY/MM/DD, press redial

3) To change time : Press INTCM, #, 6, 5, 2, Enter time HH/MM/SS in 24 Hr Format, press redial

4) To change day of week : Press INTCM, #, 6, 5, 3, Enter day (1=Sun, 2=Mon...), press redial


For more information regarding your Toshiba DKT 2010 Phone and the system that you're using, feel free to browse our extensive guides and manuals that you can find here

Or you can call me at 1-800-903-9190

The way 4 line phones work is that you need 4 lines on every jack that is connected to your phone.
You see the light probably because one of the phones has line conected and you see line appearance.

Auto Attendant
Answer Lines
1 – Feature 983
2 – Log: Dial 1020000 (3-digit DNs) or 120000 (2-digit DNs)
3 – Press AA
4 – Press LINES
5 – Line number: Dial line number (001-xxx).
6 – Line:xxx Ans:No Press CHNG to AA if auto attendant will always answer theline. If a Night Service key will be used to activate auto attendant answering, leave Ans: at No.
7 – If line has been changed to Ans:AA, press * then press TABLE.
8 – If Table:1 is OK press RINGS. (Table 1 is the default greeting table. Change to a different table (1-4) if alternate answering is required on the line being programmed.)
9 – Rings:0 – Press CHNG, dial number of rings before auto attendant answers the line, or leave at 0 for immediate answering. Allow at least 2 rings if CLID is in use.
10 – Repeat for each line to be programmed.

Notes For Night Service Mode Auto Attendant Answering
If the auto attendant will only answer lines in night service mode, line answering should be set to No as per step 6 above. Using night service will cause the AA to answer lines immediately.

http://toshibasets.com/uploads/Strata_DK_user_guide.pdf

Not sure if I understand your question correctly, but I think I just learned how to do that on an electra professional. Memory block 4-1-1 lets you go through each of the internal extensions, and you can set each extension to ring when a call comes in from any/some/all of the outside lines.
to reach memory block 4-1-1, I used a multi line terminal connected to ports 1. Press fnc => hold => # => 0 => * => line key 4. Use the fcn(?) key to cycle through the internal ports, the line key buttons to map each of the 4 lines (presumably line keys 1 through 4 on your system).
As to where to get a manual, I am not sure, I have 3 thick binders... good luck