I am replacing a head gasket and was wondering if the cylinder head bolts are (Torque To Yield)? If not, can I reuse them?

 

They can be reused. There is a specific torque sequence. You should try to find a manual. In a criss cross pattern you go so tight, then again little tighter, loosen, then loosen again, then back tight and then 90 degrees, then 90 more. Here's the manual instructions.

CYLINDER HEAD INSTALLATION Clean the gasket surfaces on the cylinder head and cylinder. Remove all traces of old gasket material. Refer to disassembly photos.
1. Install the cam chain tensioner guide. Be sure bottom end of guide is located properly in crankcase.
2. Install the two dowel pins and a new cylinder head gasket.
3. Place the cylinder head on the cylinder .Apply a film of engine oil to the cylinder head bolt threads and washers, and hand tighten the bolts. The following procedure must be used to torque the cylinder head properly:
Cylinder Bolt Torque:
10mm - 46 ft. lbs. (6.348 kg-m) 6mm - 6 ft. lbs. (.828 kg-m)
Torque all bolts evenly in a criss cross pattern
*Torque bolts to 22 ft. lbs. (3.04 kg-m)
*Torque bolts to 51 ft. lbs. (7.04 kg-m)
*Loosen bolts evenly 180° (1/2 turn)
*Loosen bolts again another 180° (1/2 turn)
*Torque bolts to 11 ft. lbs. (1.52 kg-m)
*From this point, tighten bolts evenly 90° (1/4 turn)
*Finally, tighten another 90° (1/4 turn)
*Install two 6mm bolts and torque to 6 ft. lbs. (.828 kg-m)